Where to set SWG at

[carnivalday]

In my new pool, I tested my salt level at 3800 ppms. The reading on the box is at 60% clorinating. It seems my test level is just a bit high, but how do I know where I can actually set the SWG at. Is it dependent on the RPMs of the pump? I have the pump now at 1800 rpms. Is there any calculation I can use so Im not operating this thing blindly?

 

[mknauss]

In the Poolmath app there is an Effect of Adding Chemical section that can guide you. The other way is determining how much chlorine gas the SWCG creates and then see what settings to create the FC you need.

 

[Jimrahbe]

C,

A SWCG generates the same amount of chlorine no matter what speed the pump is running, as long as it is fast enough to turn on the flow switch..

The SWCG will make no chlorine if the pump is not running. So you can adjust the output of your SWCG by adjusting the % of output and/or the time the pump is allowed to run... 1 hour at 100% generates the same amount of chlorine as 10 hours at 10%..

Tell us what size SWCG you have and how long you normally run your pump and we can give you some numbers..

The SWCG has no brain. It just generates the amount of chlorine you tell it to make, no matter what is in the pool.. It is up to you to test and then tell the SWCG to increase or decrease its chlorine generation.

Thanks,

Jim R.

 

[carnivalday]

How do I know what size SWG I have?(great info. Im learning so much here).

 

[carnivalday]

Okay I went outside with a flashlight. Its a Jandy Proseries True Clear. I didnt see any Model number on it.

 

[mknauss]

I believe that unit generates 0.92 lbs per day chlorine.

 

[carnivalday]

Okay, tell me if my conclusion is correct, or if Im way off base. The SWG doesnt actually raise the level of salt, the physical salt that was added does that. The SWG's main duty is to maintain the level that the addition of salt made it to.

 

[ajw22]

Okay, tell me if my conclusion is correct, or if Im way off base. The SWG doesnt actually raise the level of salt, the physical salt that was added does that. The SWG's main duty is to maintain the level that the addition of salt made it to.

Read this then let’s discuss...

SWG How It Works - Further Reading

 

[kimkats]

The SWG's main job is to turn the salt that was added to the pool into chlorine when it passes through the SWG.

You ARE learning SO much! Well done!

Kim

 

[carnivalday]

Allen, Im afraid my brain when into a dull fog when trying to read that. I think thats a little above my grade level right now. Im not smart enough to skip grade levels. Im still in kindergarten.

 

[carnivalday]

So Marty, if its producing .92 pounds of chlorine a day, can we back up and determine how many hours and at what percentage the setting should be to get that much chlorine daily? and then how do I determine how much I need a day?

 

[RMcGirr83]

You need to state how long you run your pump. The jandy you have produces 18 grams of chlorine per hour at 100%. If you run your pump for 6 hours and set the jandy to 100% you will generate 108 grams. You should also state what your CYA is at, it should be around 70 - 80 for having a SWG. According to pool math with a CYA level of 70 you would need to run your pump 7.75 hours with your SWG set at 100% which will set your FC level to 8 (get your level up to 8 first with liquid chlorine). Of course you should test and adjust as necessary pump run time and SWG output.

 

[carnivalday]

RMcGirr83 that is helpful! Today I am working on chemical levels in the pool; I did the total Taylor tests last week, and I couldnt get a reading on the CYA test. So Ive been advised to start at 30 and work my way up. Now on the charts I looked at, it advised the FC level should be 3-5, and I tested it last week at 4. It should be higher? I thought I was good on my FC.

 

[carnivalday]

Okay, in reading back on some of the helpful posts from the last few days, I see where Texas Splash also advised on raising the FC to 8. Ill see if I can figure out what numbers to plug in the PoolMath page, and tomorrow Ill go pick up some bleach. Thanks so much!

 

[ajw22]

RMcGirr83 that is helpful! Today I am working on chemical levels in the pool; I did the total Taylor tests last week, and I couldnt get a reading on the CYA test. So Ive been advised to start at 30 and work my way up. Now on the charts I looked at, it advised the FC level should be 3-5, and I tested it last week at 4. It should be higher? I thought I was good on my FC.

CYA of 70-80 is unnecessary in FL this time of year.

Before you go raising your FC you need to know what your CYA is. Your CYA level determines what the correct FC target should be.

 

[carnivalday]

Allen, when I did all my tests, I couldnt get any read on the CYA, which seemed to indicate it was extremely low. I was advised to start slowly in adding MA. I will do that this morning and keep retesting the CYA until I get a reading of some sort.

 

[ajw22]

You need to state how long you run your pump. The jandy you have produces 18 grams of chlorine per hour at 100%. If you run your pump for 6 hours and set the jandy to 100% you will generate 108 grams. You should also state what your CYA is at, it should be around 70 - 80 for having a SWG. According to pool math with a CYA level of 70 you would need to run your pump 7.75 hours with your SWG set at 100% which will set your FC level to 8 (get your level up to 8 first with liquid chlorine). Of course you should test and adjust as necessary pump run time and SWG output.

CYA of 70-80 with the SWG running has a FC target of 4-6, not 8. Without the SWG running you don’t want CYA that high as you have a target of 9-11 which gets FC into the zone where pH test becomes questionable.

 

[ajw22]

Allen, when I did all my tests, I couldnt get any read on the CYA, which seemed to indicate it was extremely low. I was advised to start slowly in adding MA. I will do that this morning and keep retesting the CYA until I get a reading of some sort.

You add stabilizer to raise your CYA, not MA. Stick with your plan. FC of 4 is fine for you right now. Add the stabilizer to get your CYA to around 30. Then you can work your CYA and SWG FC generation up in steps as the weather warms next year.

 

[carnivalday]

Ok, I have chemical overload. The MA I am adding will lower the pH to where it needs to be, the STABILIZER is what I need to be adding to get the CYA test up. Is that right? So my CYA target at this point should be what? Edited to add: just read your most recent post, yes, thats exactly what I needed to know. Thank you!

 

[kimkats]

To raise CYA you will buy "stablizer" like seen here: https://www.lowes.com/pd/Clorox-Pool-Spa-4-lb-Stabilizer-Pool-Balancer/50332983 You MIGHT be able to find it at Walmart but they tend to not carry pool stuff this time of year. Of course the pool $tore will have some. Don't bother getting the liquid gold CYA.

When you go do add CYA target 30 for right now. Use Pool Math to see how much you will need to add. I use a clear, plastic measure cup with oz. on the side. I use my husband white tube socks to add it. I fill up one or two depending on how much I need to add. I tie them off and hang them in front of the return. You can squeeze the socks to help it dissolve faster. Don't bother testing for the new amount of CYA until it is all dissolved and the pump has run for a couple of days to mix it all in good. Some people put the the sock in the skimmer. I worry about it blocking the water flow to the pump so don't do it that way. Do NOT pour it in to the skimmer. I know it says to do it on the bottle but ignore that.