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Thread: Is ANY algae growth normal??

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    Is ANY algae growth normal??

    Are small amounts of algae normal? I have a few small streaks and patches of algae on my pool walls and safety ledge daily. I brush them off daily and it takes about 10 mins to do all. Water is sparkling.

    I had an algae problem a month or so ago. Shocked for over 2 1/2 weeks with several days (twice) at mustard algae levels. I'm passing the overnight test but can't get the CC to 0. My cc is always .5 to 1 even after shocking. Info here:
    fighting-algae-t36335.html


    fc-8
    cc-1
    ph-7.5
    ta-110
    ch-230
    cya-50
    borates-50
    temp-87
    15,000 gal Sun Fiberglass, Glass/Lexan/Aluminum Enclosed Room, 1.5 hp Pentair Whisperflow Pump, Triton 100- 600# Sand Filter, Heat Siphon Heat Pump, 3 Dbl. Seats w/8 Jets, Waterfall, 8' Interfab Slide, Pentair SAm Spectrum Amerlite Pool Light, Stenner MHP5 Chlorine Pump, Kreepy Krauly Vacuum, Bleach, 50 ppm Borates, TF 100 Test Kit

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    Mod Squad JohnT's Avatar
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    Re: Is ANY algae growth normal??

    No. You shouldn't have any.
    TFP Moderator
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    Richard320's Avatar
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    Re: Is ANY algae growth normal??

    oops
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Richard320's Avatar
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    Re: Is ANY algae growth normal??

    In stagnant, untreated water, algae growth is normal. In a well-maintained swimming pool, no.

    Somewhere, you've got some algae "starter" still working. Could be in the filter, behind the light, under or in ladder steps, pool cover, even on pool toys or vacuum hose. Throw anything that might go in the pool in the pool while shocking it again. You might even want to pull the light out of the niche and give that area some scrubbing.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Is ANY algae growth normal??

    I'll check the niche for sure. I went thru a thorough cleaning 2 months ago and even pulled the light and cord completely out and scrubbed and chlorine soaked for a week. All toys, hoses, covers, etc.... in the pool while at mustard shock level also.
    Could I be introducing it in my well water? I may need to treat my tank and plumbing as well since it's not treated in any way.
    15,000 gal Sun Fiberglass, Glass/Lexan/Aluminum Enclosed Room, 1.5 hp Pentair Whisperflow Pump, Triton 100- 600# Sand Filter, Heat Siphon Heat Pump, 3 Dbl. Seats w/8 Jets, Waterfall, 8' Interfab Slide, Pentair SAm Spectrum Amerlite Pool Light, Stenner MHP5 Chlorine Pump, Kreepy Krauly Vacuum, Bleach, 50 ppm Borates, TF 100 Test Kit

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    linen's Avatar
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    Re: Is ANY algae growth normal??

    Quote Originally Posted by captjohn
    Could I be introducing it in my well water? I may need to treat my tank and plumbing as well since it's not treated in any way.
    Yes, though I think if you are just topping off, properly maintained FC levels should be able to handle it. Every few years I do a bleach treatment of my well, usually when the smell gets pretty strong.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: Is ANY algae growth normal??

    I would consider any 1ppm CC result as an indicator of needing to shock. Especially if I saw it more than once.

    It sounds like you have a bloom that isn't going freaky green because you're maintaining the pool with enough chlorine to keep it at bay.

    Have you performed an OCLT on the pool since this started occurring?

    Shocking the pool when it's like that won't take 2.5 weeks like last time but the longer you let it go, the more time it will take I'm sure. I'd do it now and get it over with so you can enjoy the rest of the swim season.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

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    Re: Is ANY algae growth normal??

    Does the well water contain nitrates?
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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    Re: Is ANY algae growth normal??

    Quote Originally Posted by anonapersona
    Does the well water contain nitrates?
    I have no idea and don't know were I could get it tested. Pool store???
    15,000 gal Sun Fiberglass, Glass/Lexan/Aluminum Enclosed Room, 1.5 hp Pentair Whisperflow Pump, Triton 100- 600# Sand Filter, Heat Siphon Heat Pump, 3 Dbl. Seats w/8 Jets, Waterfall, 8' Interfab Slide, Pentair SAm Spectrum Amerlite Pool Light, Stenner MHP5 Chlorine Pump, Kreepy Krauly Vacuum, Bleach, 50 ppm Borates, TF 100 Test Kit

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    Re: Is ANY algae growth normal??

    While you were away recently (for 10 days?), do you think the FC dropped below the min for the CYA level?
    Did someone maintain/test the pool for you while you were away?

    Basically, you have an indoor pool. I am wondering if the CYA needs to be closer to 20 to keep things happy.
    Did Richard/Chem Geek mention anything about possibly lowering the CYA in prior posts?
    Direct sunlight does not hit your pool - correct? Also, you mentioned adding more ventilation. Did that happen?

    Yep, you gotta' shock that 1CC into submission
    And with all the variables of your pool, it could take a while to get rid of it.

    btw, no more citric acid has been added recently (within last month) - right?
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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  11. Back To Top    #11

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    Re: Is ANY algae growth normal??

    Actually, while I was away, my chlorine level rose. I left the pool at shock level and I was still learning to set my Stenner pump. I had it set too high and the pool was at Mustard shock level when I got home. So yes, I had some "thing" taking care of the pool

    Chem Geek and Jason have spoke of difficulty in lowering CC due to the lower UV I receive with the clear lexan roof. Nothing of lowering the CYA.
    I receive full sun on the roof but it filters the UV.
    I haven't added any more ventilation. I have an exhaust fan and all doors are open but it's 100-105 degrees inside in the heat of the day, 95 today outside. The added fan will be a later project.

    It's at 20ppm and holding tonight. I'll test again in the morning. I'm also checking the niche in the morning.

    Ummm, citric acid???? yesss. But I never let the FC go below my target for my cya (against the instructions). I know what you said but I didn't think I'd get caught. Is it still a problem if I keep the FC up?
    I'm also using a phosphonic - polymaleic acid based sequestrant.
    15,000 gal Sun Fiberglass, Glass/Lexan/Aluminum Enclosed Room, 1.5 hp Pentair Whisperflow Pump, Triton 100- 600# Sand Filter, Heat Siphon Heat Pump, 3 Dbl. Seats w/8 Jets, Waterfall, 8' Interfab Slide, Pentair SAm Spectrum Amerlite Pool Light, Stenner MHP5 Chlorine Pump, Kreepy Krauly Vacuum, Bleach, 50 ppm Borates, TF 100 Test Kit

  12. Back To Top    #12
    Butterfly's Avatar
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    Re: Is ANY algae growth normal??

    Ummm, citric acid???? yesss. But I never let the FC go below my target for my cya (against the instructions). I know what you said but I didn't think I'd get caught.
    hehe, gotcha

    Well, Captain, my thoughts (from previous thread) still lean towards water replacement. Not just talking about the algae or the CC, but the overall problems.

    Let's see what others say.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

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    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Is ANY algae growth normal??

    Morning Update:
    OCLT 0-.5 ppm, CC-1ppm, Water-crystal, Tiny spots of visible algae on walls.

    Removed the light from niche and found dead (white) algae on the light fixture. Last time it was black (2 months ago). At that time I installed a T and 90 degree ell in the conduit near the floor below the transformer and occasionally pour a bleach solution into the conduit that feeds into the niche. I'm guessing that's why the algae was dead. I soaked the light in a bucket of strong bleach water for a week last time so now I've dismantled the light assy. The gasket had a flaky substance around the outside and a couple of drops of moisture behind the lens. Either algae or decomposition on the gasket. I've ordered a new one and soaking the parts, except the light housing, in bleach. I'll wipe the outside of the housing with a strong bleach solution a few times while apart. After I reassemble, I'll put it in a bucket of bleach for a while for insurance.

    What am I missing on the cleaning process? If it's clean, algae shouldn't return, right? Could this be my source of CC? I know it's the algae injector! Any other suggestions? I was going to replace the entire light until I saw the $450+ price tag.

    Thanks for everyones help!
    15,000 gal Sun Fiberglass, Glass/Lexan/Aluminum Enclosed Room, 1.5 hp Pentair Whisperflow Pump, Triton 100- 600# Sand Filter, Heat Siphon Heat Pump, 3 Dbl. Seats w/8 Jets, Waterfall, 8' Interfab Slide, Pentair SAm Spectrum Amerlite Pool Light, Stenner MHP5 Chlorine Pump, Kreepy Krauly Vacuum, Bleach, 50 ppm Borates, TF 100 Test Kit

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    Re: Is ANY algae growth normal??

    Quote Originally Posted by captjohn
    I know it's the algae injector!
    That's priceless. Kinda like algae salt.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

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    Re: Is ANY algae growth normal??

    If your pool is not exposed to UV, then it would be better to not have the CYA be so high. Usually for indoor pools we recommend more like 20 ppm or no more than 30 ppm. That should somewhat help keep the CC lower though many people find they need to use supplemental oxidation such as a UV system or use of non-chlorine shock (MPS). It will also be easier for you to shock the pool (if needed) using less chlorine.

    It does seem that you have yellow/mustard algae that prefers shade and may have been hiding out in the light niche so was likely the source or reintroduction of the algae into the pool. If you have removable ladders, be sure to check under them as well.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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    Re: Is ANY algae growth normal??

    Thanks Richard. I'll lower the cya which won't be very hard since kids and slide = frequent top offs. Here's a quote from GE's Lexan tech sheet: "LEXAN Corrugated sheet transmits a high portion of visible light. It is essentially opaque to ultraviolet light at wavelengths below 385 nanometers". I receive some direct sunlight in morning and evening thru the screen where the glass doors are open but I'm sure it's filtered by the atmosphere.

    No steps, ladders etc. in the pool. Molded stairs and the hand rail isn't in the water. The light is the only thing in water except for multiple return jets. I have all valves open so shocked water is flowing everywhere. The light is the repeat offender and there was no algae in the niche itself. Hopefully replacing the rubber gasket will help as all other parts are SS or glass. I've had all toys, tools, cover, etc. in the pool multiple times while as mustard shock levels also. Today I aimed 1 return, 10' away, directly at the niche to try and increase flow around it.

    Wish me luck!
    15,000 gal Sun Fiberglass, Glass/Lexan/Aluminum Enclosed Room, 1.5 hp Pentair Whisperflow Pump, Triton 100- 600# Sand Filter, Heat Siphon Heat Pump, 3 Dbl. Seats w/8 Jets, Waterfall, 8' Interfab Slide, Pentair SAm Spectrum Amerlite Pool Light, Stenner MHP5 Chlorine Pump, Kreepy Krauly Vacuum, Bleach, 50 ppm Borates, TF 100 Test Kit

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    Re: Is ANY algae growth normal??

    Quote Originally Posted by captjohn
    Morning Update:
    OCLT 0-.5 ppm, CC-1ppm, Water-crystal, Tiny spots of visible algae on walls.

    Removed the light from niche and found dead (white) algae on the light fixture. Last time it was black (2 months ago). At that time I installed a T and 90 degree ell in the conduit near the floor below the transformer and occasionally pour a bleach solution into the conduit that feeds into the niche. I'm guessing that's why the algae was dead. I soaked the light in a bucket of strong bleach water for a week last time so now I've dismantled the light assy. The gasket had a flaky substance around the outside and a couple of drops of moisture behind the lens. Either algae or decomposition on the gasket. I've ordered a new one and soaking the parts, except the light housing, in bleach. I'll wipe the outside of the housing with a strong bleach solution a few times while apart. After I reassemble, I'll put it in a bucket of bleach for a while for insurance.

    What am I missing on the cleaning process? If it's clean, algae shouldn't return, right? Could this be my source of CC? I know it's the algae injector! Any other suggestions? I was going to replace the entire light until I saw the $450+ price tag.

    Thanks for everyones help!
    A hypothetical:

    If we completely sterilize our pool, introduce sterile water, I mean there are NO organics in the pool and we do not add any chlorine, how long till we are overrun with algae? I don't think it will take very long, algae is being introduced to the water all the time, can't be avoided.
    15 X 30 X 3.6 Ester williams AGP
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  18. Back To Top    #18
    frogabog's Avatar
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    Re: Is ANY algae growth normal??

    Sun and temperature is the biggest factor in algae growth. If the sun shines on the water, I'd give it a week maximum and then it'll go major green with a quickness. A more realistic time frame would be 3-4 days.

    When I fill my pool in the sun, the water turns green at about 4" (roughly half hour into filling). By green I mean a tint of green, not a swamp of course but still it's growing algae THAT fast.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

  19. Back To Top    #19

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    Re: Is ANY algae growth normal??

    Under ideal conditions with plenty of sunlight, nutrients and warm temperature algae can double in population every 3 to 8 hours. If it becomes visible in less than 1-2 days, it was already there just below the visible threshold. As for water color when filling, the water probably already had that tint but isn't seen until it gets to sufficient depth.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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  20. Back To Top    #20
    linen's Avatar
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    Re: Is ANY algae growth normal??

    Quote Originally Posted by chem geek
    As for water color when filling, the water probably already had that tint but isn't seen until it gets to sufficient depth.
    Is that fill water tint typically algae?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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