Difference between revisions of "Algaecide" - Further Reading

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=What are Algaecides for Pool Water?=
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While it’s hard to think about swimming in chemicals, diving into green and cloudy water is not so attractive either.
Algaecides are chemicals that may inhibit algae growth in pool water.
 
  
Algaecide at safe doses will not clear an algae problem once you have algae in pool water.
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If you want to enjoy a crystal clear blue pool, you’re going to need to use a variety of pool chemicals to keep it clean. When many people spot algae growth in their pool, they will quickly turn to algaecide to clear it out. Not so quick though. Using algaecide in pool water to deter algae growth actually requires a bit more research.
  
Algaecides do not sanitize the pool water.
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Continue reading for Trouble Free Pool’s recommendations regarding the use of algaecide in your pool.
  
In general TFP does not recommend the use of algaecides for regular pool care. If you maintain the proper [https://www.troublefreepool.com/blog/2019/01/18/chlorine-cya-chart/ FC/CYA] ratio in your pool water algae will not take hold.
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=What are Algaecides?=
 +
Algaecides are a chemical that may inhibit algae growth in pool water.
  
Using algaecide regularly masks the fact that the pool water is not safe to swim. Chlorine serves both as an algaecide and a sanitizer. If you get algae, your chlorine level is too low for swimming because there isn’t enough to prevent the transfer of pathogens. No amount of algaecide will make the water safe even if it keeps the water crystal clear. This is the fundamental reason we don’t recommend regular algaecide use during swimming season.<ref>https://www.troublefreepool.com/threads/algaecide-and-getting-rid-of-algae-in-pool-most-effective-and-economical.192831/post-1699166</ref>
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Unfortunately, using algaecide in safe doses will not clear an algae problem once it's already appeared in your pool water. It is also important to note that algaecides do not actually sanitize pool water either.
  
Algaecides are used as a preventive treatment either at winter closing or specific processes like Ascorbic Acid treatments when the FC level must be low.  
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In general, Trouble Free Pool does not recommend using algaecide for regular pool care. As long as you maintain the proper FC/CYA ratio in your pool, algae will not take over.
  
For closing a pool when water temperatures is above 60F an algaecide with Polyquat 60 may prevent algae and having a green pool when opening.
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==Concerns Regarding the Use of Algaecide in Pool Water==
 +
Using algaecides regularly masks the fact that the pool water is not safe to swim. Chlorine already serves as both an algaecide and a sanitizer. If you get algae in your pool it signifies that your chlorine level is too low because there isn't enough to prevent the transfer of pathogens. That also means that the level is too low for swimming as well. No amount of algaecide will make the water safe even if it keeps the water crystal clear. This is the fundamental reason we don't recommend regular algaecide use during the swimming season.<ref>https://www.troublefreepool.com/threads/algaecide-and-getting-rid-of-algae-in-pool-most-effective-and-economical.192831/#post-1699166</ref>
  
=What is Polyquat 60?=
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Instead, algaecide should be used as a preventive treatment either when closing up for winter or during specific processes such as Ascorbic Acid treatments when the FC level must be low already.
Polyquat 60 is short for Poly{oxyethylene(dimethyliminio)Ethylene (dimethyliminio)ethylene dichloride}<ref>http://finoric.com/PolyquaterniumWSCP.htm</ref> 60% and is a quaternary ammonium cationic polymer.<ref>https://www.troublefreepool.com/threads/polyquat-algaecides-mode-of-action.46432/#post-388431</ref>It is a chemical algaecide. Many manufacturers bottle it. Look for pure Polyquat 60 like from Pro Team.
 
  
Chlorine will oxidize Polyquat 60.  
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=Polyquat 60: Trusted for Use as Algaecide in Pool Water=
 +
If you are winterizing a pool when the water temperature is above 60°F, using an algaecide with Polyquat 60 may prevent algae and a green pool when pool season is back in full swing.
  
Polyquat 60 is a mild clarifier. The polyquat turn into a clarifier when broken down.<ref>https://www.troublefreepool.com/threads/fc-consumption-when-closing-with-algaecide.85136/post-728506</ref>
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==What is Polyquat 60?==
 +
Polyquat 60 is short for Polyoxyethylene (dimethylamino) Ethylene (dimethylamino) ethylene dichloride<ref>2. http://finoric.com/PolyquaterniumWSCP.htm</ref> 60% and is a quaternary ammonium cationic polymer.<ref>3. https://www.troublefreepool.com/threads/polyquat-algaecides-mode-of-action.46432/#post-388431</ref>. It is a type of chemical algaecide used to prevent algae growth. Many manufacturers bottle this to market for pool cleaning. It’s important when shopping around to look for pure Polyquat 60 such as from the brand ProTeam.
 +
==Some Considerations to Keep in Mind When Using Polyquat 60==
 +
*Some Chlorine will oxidize Polyquat 60.
 +
*Polyquat 60 is a mild clarifier. The polyquat turns into a clarifier when broken down.<ref>https://www.troublefreepool.com/threads/fc-consumption-when-closing-with-algaecide.85136/post-728506</ref>
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*This is the same sanitizer used in the Opti-Free contact lens solution so the chemical is safe for eyes as well.<ref>https://www.troublefreepool.com/threads/intex-pool-winterizing-they-dont-make-clips-for-intex-pools.185746/post-1639115</ref>
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*Polyquat 30 is a lower concentration of Polyquat.
  
Polyquat 60 is the sanitizer in optifree contact lens solution so it's also safe for eyes.<ref>https://www.troublefreepool.com/threads/intex-pool-winterizing-they-dont-make-clips-for-intex-pools.185746/post-1639115</ref>
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Polyquat is very shelf stable and so it is not prone to degrading if it is sitting for a long period of time.
  
Polyquat 30 is a lower concentration of Polyquat.
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It is important to follow the instructions for use that are found on the bottle for proper circulation of the water.
  
Polyquat is very stable and is not expected to degrade if sitting on a shelf.
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==Who Makes Polyquat 60?==
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Buckman Laboratories, in Memphis, Tennesee, manufactures all the Polyquat sold in the US, regardless of the label. Brands such as Arch (HTH), BioLab (Bioguard, Omni, Pool Time, Aqua-Chem, Sun, and many others), LaPorte (Robarb, etc.) are all simply repackaged (and possibly diluted) forms of the product that Buckman Labs produces.<ref>https://www.troublefreepool.com/threads/which-brand-of-polyquat.51526/post-435931</ref>
  
Follow the instructions on the bottle for circulating the water.
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==How To Use Polyquat 60==
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The following is Buckman Labs’ recommendation on how to use Polyquat 60 for closing your pool for the season.<ref>https://www.troublefreepool.com/threads/i-am-a-stranger-at-the-pool-store.8236/post-69227</ref>
  
==Who Makes Polyquat 60?==
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As they recommend for proper winterization, the pool should be "shocked" with about 5-10ppm chlorine to destroy any lingering oxidant demand and remove any residual ammonia or chloramine, etc. After a couple of days, adjust the pH back to 7.2-7.6 and add Polyquat 60 at the maximum rate as instructed per the label. This approach allows you to receive the highest benefit from both chemicals.  
Buckman Laboratories, in Memphis, TN, makes all the polyquat sold in the US, regardless of the label. Arch(HTH), BioLab (Bioguard, Omni, Pool Time, Aqua Chem, Sun, many others), LaPorte (Robarb, etc.) ALL simply repackage -- and possibly, dilute -- what Buckman makes.<ref>https://www.troublefreepool.com/threads/which-brand-of-polyquat.51526/post-435931</ref>
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Another point that they make regarding using this algaecide in pool water is that after the addition of Polyquat 60, it’s important to keep the circulation pump on for at least 24 hours to make sure that the algaecide is thoroughly distributed throughout the pool.
  
==How To Use Polyquat 60 in Pool Winterization?==
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If you raise your water to SLAM FC level then you should let the FC drift down before adding Polyquat 60. Having a moderately higher level (½ SLAM level so the FC/CYA ratio of 20%) is okay as well. The idea is that the Polyquat should last through the winter even if the chlorine does not.<ref>https://www.troublefreepool.com/threads/polyquat-question.106076/post-928410</ref>
The following is Buckman Labs (the makers of most PolyQuat products) recommendation on how to use the product for closing a pool:<ref>https://www.troublefreepool.com/threads/i-am-a-stranger-at-the-pool-store.8236/post-69227</ref>
 
  
''In our recommended approach for winterization, the pool should be "shocked" with about 5-10 ppm chlorine to destroy any lingering oxidant demand, to remove any residual ammonia or chloramine, etc. After a couple of days, adjust the pH back to 7.2-7.6 and add Polyquat 60 at the maximum rate allowed by the label. This approach allows you to have the maximum benefit from both chemicals. One more point about winterizing: after the addition of Polyquat 60, be sure to keep the circulation pump on for at least 24 hours to make sure that the Polyquat 60 is thoroughly distributed throughout the pool.''
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Buckman Labs says that even if the Polyquat is broken down, it is still effective when used as an algaecide. Moderate to high levels of chlorine break down Polyquat but it still only transforms the formula into shorter chain polymers that are still just as effective.<ref>9. https://www.troublefreepool.com/threads/poly-quat-question.853/post-6445</ref>
  
If you raise your water to SLAM FC level then let the FC drift down before adding Polyquat 60. Having a moderately higher level (say, half-SLAM level so FC/CYA ratio of 20%) is OK, but the idea is that the Polyquat should last through the winter even if the chlorine does not.<ref>https://www.troublefreepool.com/threads/polyquat-question.106076/post-928410</ref>
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==The Advantages of Using Polyquat 60 During Winterization==
 +
If you close the pool when the water temperature is cold (50ºF or below), then the algaecide will last for a much longer time even in the presence of chlorine. That's why this is the recommended approach.
  
Buckman Labs says that the Polyquat that is broken down is still effective as an algaecide. Moderate to high levels of chlorine break down polyquat, but only turn it into shorter chain polymers that are still effective.<ref>https://www.troublefreepool.com/threads/poly-quat-question.853/post-6445</ref>
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Basically in warm pool temperatures, after a week the Polyquat might degrade by about a third with normal chlorine levels. Meanwhile, if the pool temperature is closer to 50ºF, it would take perhaps 5-7 weeks for that same level of degradation to occur. That being said, even if you close your pool late and open early, there may still be some leftover residual of the algaecide and even the chlorine when you open in spring.<ref>https://www.troublefreepool.com/threads/fc-consumption-when-closing-with-algaecide.85136/post-728592</ref>
  
Also, if you close the pool with the water temperature cold (50ºF or below), then the algaecide will last a much longer time even in the presence of chlorine. That's the recommended approach.
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Polyquat has been shown to last longer than chlorine, especially in sunlight. The main advantage of using Polyquat when winterizing is that in a pool exposed to any sunlight, the Polyquat will still last, especially if the water is cold. This helps to prevent algae growth even if the chlorine level lowers to 0. If you cover a pool and close it when cold, then chlorine will last longer as well.<ref>https://www.troublefreepool.com/threads/acceptable-level-of-chlorine-w-solid-pool-cover.67679/post-582957</ref>
  
Basically, at warm pool temperatures in one week the Polyquat might degrade by at about one-third with normal chlorine levels, but at 50ºF it would take perhaps 5-7 weeks for that same level of degradation to occur. So if you close late enough and open early enough, you could have the algaecide and even the chlorine still have some residual when you open in spring.<ref>https://www.troublefreepool.com/threads/fc-consumption-when-closing-with-algaecide.85136/post-728592</ref>
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==How To Use Polyquat 60 in Ascorbic Acid Treatments==
 +
Polyquat 60 needs to be added weekly throughout the whole time that you have the chlorine levels below normal (or at zero during the ascorbic acid treatment). It does not last forever and is not to be used as a one-time dose unless you only have the chlorine below or at zero for less than a week.<ref>https://www.troublefreepool.com/threads/ta-extremely-high-should-i-do-something.60450/post-509207</ref>
  
Polyquat lasts longer than chlorine especially in sunlight. The main advantage of using Polyquat on closing is that in a pool exposed to any sunlight, the Polyquat will last, especially if the water is cold, so will help to prevent algae growth even if the chlorine level gets to 0. If you cover a pool and close it when cold, then chlorine can last a long time.<ref>https://www.troublefreepool.com/threads/acceptable-level-of-chlorine-w-solid-pool-cover.67679/post-582957</ref>
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It is also important to note that you should not mix the commonly used, "Jack's Magic Magenta Stuff" pool cleaner formula and Polyquat in a pool. According to the Material Safety Data Sheet (MSDS), Jack's Magenta Stuff is an acrylic acid copolymer. That means that it is a negatively charged polymer designed to attract and then bind to positively charged metal ions. On the other hand, Polyquat is a positively charged polymer. When you mix these two, you may form a cloudy mess in your pool water. Due to this, Trouble Free Pool recommends that you should never, mix these two.<ref>https://www.troublefreepool.com/threads/learned-another-lesson-jacks-magenta-polyquat-60.75162/post-645522</ref>
  
==How to Use Polyquat 60 in Ascorbic Acid Treatments?==
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Polyquat 60 needs to be added weekly during the duration of time that you have the chlorine below normal (or at zero during the ascorbic acid treatment). It does not last forever and is not a one-time dose unless you are only having the chlorine be low or zero for less than a week.<ref>https://www.troublefreepool.com/threads/ta-extremely-high-should-i-do-something.60450/post-509207</ref>
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=Be Cautious of Algaecides Containing Chemicals or Metals=
 +
Many algaecides sold at pool stores contain copper and you definitely do not want that accumulating in your pool water. Having copper in your pool water can stain and also turn blonde hair green. Unfortunately, the only way to remove copper from pool water is by completely draining the pool.  
  
Do not mix Jack's Magenta Stuff and Polyquat in a pool.  According to the MSDS Jack's Magenta Stuff is acrylic acid copolymer. That's a negatively charged polymer designed to attract and bind to positively charged metal ions. Polyquat is a positively charged polymer. When you mix these two, you form a cloudy precipitated mess. You should never, ever, mix these two together in a pool.<ref>https://www.troublefreepool.com/threads/learned-another-lesson-jacks-magenta-polyquat-60.75162/post-645522</ref>
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If you choose to use an algaecide, it’s smart to know what all the chemicals are in it and what their effects will be on your pool water. If you are not sure, you can always ask on the Trouble Free Pool Forum before adding them to your pool.
  
=Beware of Algaecide that Contain Unwanted Chemicals or Metals=
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=Algaecides That Are Not Recommended=
Many algaecides sold at pool stores contain copper.  You do not want copper accumulating in your pool water.  The only way to remove copper from pool water is by draining the pool.  Copper in pool water can cause staining or turn blonde hair green.  For more see [[Copper in Pool Water]].
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There are a few brands on the market that pose as an algaecide but are actually far from it.
  
If you choose to use an algaecide, know what all the chemicals in it are and their effect on your pool water. If you are not sure, ask on the [https://www.troublefreepool.com/forums/ TroubleFreePool Forum] before adding it to your pool water.
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Aquabrite Yellow Quell is sodium bromide that will convert your swimming pool from a chlorine pool to a bromine pool. Unfortunately, the only way to fix that is to drain almost the entirety of the water from your pool.<ref>https://www.troublefreepool.com/threads/murky-green-water.195541/post-1723875</ref>
  
=Not Recommended Algaecides=
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Labels can be misleading. In fact, bromide is also NOT an algaecide, no matter what the bottle may say. The presence of bromide in water has been shown to not be effective whatsoever in the fight against algae.
==Aquabrite Yellow Quell==
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Aquabrite Yellow Quell is sodium bromide and will convert your pool from a chlorine pool to a bromine pool.  The only way to correct that is to drain almost the entirety of the water.<ref>https://www.troublefreepool.com/threads/murky-green-water.195541/post-1723875</ref>
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=How To Be Effective in Your Fight Against Pool Algae=
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It’s no fun to finally open your pool for the season only to discover that it is filled with disgusting green algae.
  
Bromide is NOT an algaecide, no matter what the bottle says. The presence of bromide in water does not bother algae one bit.
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Due to misleading labels and information on the market, it can be difficult to know what to do and how to handle it. As we have reviewed, Trouble Free Pool only recommends using an algaecide in pool water that contains Polyquat 60 during the winterization process for an effective, preventative solution.

Revision as of 18:17, 30 July 2020

While it’s hard to think about swimming in chemicals, diving into green and cloudy water is not so attractive either.

If you want to enjoy a crystal clear blue pool, you’re going to need to use a variety of pool chemicals to keep it clean. When many people spot algae growth in their pool, they will quickly turn to algaecide to clear it out. Not so quick though. Using algaecide in pool water to deter algae growth actually requires a bit more research.

Continue reading for Trouble Free Pool’s recommendations regarding the use of algaecide in your pool.

What are Algaecides?

Algaecides are a chemical that may inhibit algae growth in pool water.

Unfortunately, using algaecide in safe doses will not clear an algae problem once it's already appeared in your pool water. It is also important to note that algaecides do not actually sanitize pool water either.

In general, Trouble Free Pool does not recommend using algaecide for regular pool care. As long as you maintain the proper FC/CYA ratio in your pool, algae will not take over.

Concerns Regarding the Use of Algaecide in Pool Water

Using algaecides regularly masks the fact that the pool water is not safe to swim. Chlorine already serves as both an algaecide and a sanitizer. If you get algae in your pool it signifies that your chlorine level is too low because there isn't enough to prevent the transfer of pathogens. That also means that the level is too low for swimming as well. No amount of algaecide will make the water safe even if it keeps the water crystal clear. This is the fundamental reason we don't recommend regular algaecide use during the swimming season.[1]

Instead, algaecide should be used as a preventive treatment either when closing up for winter or during specific processes such as Ascorbic Acid treatments when the FC level must be low already.

Polyquat 60: Trusted for Use as Algaecide in Pool Water

If you are winterizing a pool when the water temperature is above 60°F, using an algaecide with Polyquat 60 may prevent algae and a green pool when pool season is back in full swing.

What is Polyquat 60?

Polyquat 60 is short for Polyoxyethylene (dimethylamino) Ethylene (dimethylamino) ethylene dichloride[2] 60% and is a quaternary ammonium cationic polymer.[3]. It is a type of chemical algaecide used to prevent algae growth. Many manufacturers bottle this to market for pool cleaning. It’s important when shopping around to look for pure Polyquat 60 such as from the brand ProTeam.

Some Considerations to Keep in Mind When Using Polyquat 60

  • Some Chlorine will oxidize Polyquat 60.
  • Polyquat 60 is a mild clarifier. The polyquat turns into a clarifier when broken down.[4]
  • This is the same sanitizer used in the Opti-Free contact lens solution so the chemical is safe for eyes as well.[5]
  • Polyquat 30 is a lower concentration of Polyquat.

Polyquat is very shelf stable and so it is not prone to degrading if it is sitting for a long period of time.

It is important to follow the instructions for use that are found on the bottle for proper circulation of the water.

Who Makes Polyquat 60?

Buckman Laboratories, in Memphis, Tennesee, manufactures all the Polyquat sold in the US, regardless of the label. Brands such as Arch (HTH), BioLab (Bioguard, Omni, Pool Time, Aqua-Chem, Sun, and many others), LaPorte (Robarb, etc.) are all simply repackaged (and possibly diluted) forms of the product that Buckman Labs produces.[6]

How To Use Polyquat 60

The following is Buckman Labs’ recommendation on how to use Polyquat 60 for closing your pool for the season.[7]

As they recommend for proper winterization, the pool should be "shocked" with about 5-10ppm chlorine to destroy any lingering oxidant demand and remove any residual ammonia or chloramine, etc. After a couple of days, adjust the pH back to 7.2-7.6 and add Polyquat 60 at the maximum rate as instructed per the label. This approach allows you to receive the highest benefit from both chemicals.

Another point that they make regarding using this algaecide in pool water is that after the addition of Polyquat 60, it’s important to keep the circulation pump on for at least 24 hours to make sure that the algaecide is thoroughly distributed throughout the pool.

If you raise your water to SLAM FC level then you should let the FC drift down before adding Polyquat 60. Having a moderately higher level (½ SLAM level so the FC/CYA ratio of 20%) is okay as well. The idea is that the Polyquat should last through the winter even if the chlorine does not.[8]

Buckman Labs says that even if the Polyquat is broken down, it is still effective when used as an algaecide. Moderate to high levels of chlorine break down Polyquat but it still only transforms the formula into shorter chain polymers that are still just as effective.[9]

The Advantages of Using Polyquat 60 During Winterization

If you close the pool when the water temperature is cold (50ºF or below), then the algaecide will last for a much longer time even in the presence of chlorine. That's why this is the recommended approach.

Basically in warm pool temperatures, after a week the Polyquat might degrade by about a third with normal chlorine levels. Meanwhile, if the pool temperature is closer to 50ºF, it would take perhaps 5-7 weeks for that same level of degradation to occur. That being said, even if you close your pool late and open early, there may still be some leftover residual of the algaecide and even the chlorine when you open in spring.[10]

Polyquat has been shown to last longer than chlorine, especially in sunlight. The main advantage of using Polyquat when winterizing is that in a pool exposed to any sunlight, the Polyquat will still last, especially if the water is cold. This helps to prevent algae growth even if the chlorine level lowers to 0. If you cover a pool and close it when cold, then chlorine will last longer as well.[11]

How To Use Polyquat 60 in Ascorbic Acid Treatments

Polyquat 60 needs to be added weekly throughout the whole time that you have the chlorine levels below normal (or at zero during the ascorbic acid treatment). It does not last forever and is not to be used as a one-time dose unless you only have the chlorine below or at zero for less than a week.[12]

It is also important to note that you should not mix the commonly used, "Jack's Magic Magenta Stuff" pool cleaner formula and Polyquat in a pool. According to the Material Safety Data Sheet (MSDS), Jack's Magenta Stuff is an acrylic acid copolymer. That means that it is a negatively charged polymer designed to attract and then bind to positively charged metal ions. On the other hand, Polyquat is a positively charged polymer. When you mix these two, you may form a cloudy mess in your pool water. Due to this, Trouble Free Pool recommends that you should never, mix these two.[13]


Be Cautious of Algaecides Containing Chemicals or Metals

Many algaecides sold at pool stores contain copper and you definitely do not want that accumulating in your pool water. Having copper in your pool water can stain and also turn blonde hair green. Unfortunately, the only way to remove copper from pool water is by completely draining the pool.

If you choose to use an algaecide, it’s smart to know what all the chemicals are in it and what their effects will be on your pool water. If you are not sure, you can always ask on the Trouble Free Pool Forum before adding them to your pool.

Algaecides That Are Not Recommended

There are a few brands on the market that pose as an algaecide but are actually far from it.

Aquabrite Yellow Quell is sodium bromide that will convert your swimming pool from a chlorine pool to a bromine pool. Unfortunately, the only way to fix that is to drain almost the entirety of the water from your pool.[14]

Labels can be misleading. In fact, bromide is also NOT an algaecide, no matter what the bottle may say. The presence of bromide in water has been shown to not be effective whatsoever in the fight against algae.

How To Be Effective in Your Fight Against Pool Algae

It’s no fun to finally open your pool for the season only to discover that it is filled with disgusting green algae.

Due to misleading labels and information on the market, it can be difficult to know what to do and how to handle it. As we have reviewed, Trouble Free Pool only recommends using an algaecide in pool water that contains Polyquat 60 during the winterization process for an effective, preventative solution.