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Thread: CYA above 140

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    CYA above 140

    Hello

    Just starting out in the pool business and I have a customer with CYA at a hi level. I took my reading with the Taylor k2006 and with the colorQ pro 7 both read Hi. My customer has a 19000 Gallon pool so I drained 6500 Gallons the other day and refilled it. I ran the filter the normal 8 hrs and went back to take a reading. The CYA level is still reading HI. So my question is will draining another 6500 Gallons of water solve this problem or will I be wasting more time? Also I'm reading to many different way to add acid to a pool to lower Alkalinity could you please tell me the proper way to pour acid in the pool for Alkalinity...Thanks
    14,000 Gal. In-Ground Plaster Salt Water Pool
    Pentair IntelliFlo VS Pump
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    Aqua Rite Chlorine Generator w/ T-Cell-3
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    Mod Squad jblizzle's Avatar
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    Re: CYA above 140

    Welcome to TFP !

    You need to be more specific with the CYA level. What reading are you getting with the K2006? If it is over 100ppm, try diluting the pool water 50/50 with tap water and redoing the test, doubling the reading. You can then determine the % of water replacement required to let it to a certain level.

    For the TA reduction, there is an article in Pool School that describes the process. Basically using acids to lower pH and TA and then aerating to raise the pH back up so you can add more acid ... and repeat.

    The slug method for TA reduction is a myth and can damage the pool. Just pour the acid slowly in front of a return.

    Posted from my Droid with Tapatalk ... sorry if my response is short
    Jason, TFP Moderator
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    Re: CYA above 140

    Use a dilution test using 1 part pool water to 1 part fresh (2 parts, or 3 parts etc etc) water to get a true CYA reading, there's no point in saying if I drain x, as you really need to know albeit roughly what the current CYA level actually is. Draining 50% of the pool water will lower the CYA level by that amount and so on.

    As for your question regarding adding acid to a pool we generally recommend dissolving it in a bucket before adding it in front of the returns (or water inlets) to the pool.

    Regards
    Stuart
    Stuart Murray
    Scotland UK
    UK NPPOC

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    Re: CYA above 140

    Ok thanks for the tip! Next time I go I will do the 50% on the cya test. The reason I asked about the acid is bc the guy that tought me said to pour the acid in a circle in the deep end. Now I know that doesn't matter.

    14,000 Gal. In-Ground Plaster Salt Water Pool
    Pentair IntelliFlo VS Pump
    Cartridge Filter
    Aqua Rite Chlorine Generator w/ T-Cell-3
    6-panel Solar Heater
    Purex Triton MiniMax Plus 400 Gas Heater
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    Re: CYA above 140

    Read how to Lower Total Alkalinity. The key to lowering it a lot is to lower the overall pool pH to around 7.0 and aerate the water as much as possible and add acid to keep the pH low. The aeration at low pH drives carbon dioxide out of the pool water faster.
    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: CYA above 140

    Ok I went back to my pool today 19000 gallons and after draining 6500 gallons my CYA at a 50/50 with tap water and pool water reads 100. So I guess we are talking a 200 CYA count. On that note does this mean I must drain at least 50% of the pool water or maybe 75% of the water? I just got this acct so it won't look bad on my part if I tell my customer he needs to drain more water.
    14,000 Gal. In-Ground Plaster Salt Water Pool
    Pentair IntelliFlo VS Pump
    Cartridge Filter
    Aqua Rite Chlorine Generator w/ T-Cell-3
    6-panel Solar Heater
    Purex Triton MiniMax Plus 400 Gas Heater
    Built 1999

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    UnderWaterVanya's Avatar
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    Re: CYA above 140

    Quote Originally Posted by Keepinitclean
    Ok I went back to my pool today 19000 gallons and after draining 6500 gallons my CYA at a 50/50 with tap water and pool water reads 100. So I guess we are talking a 200 CYA count. On that note does this mean I must drain at least 50% of the pool water or maybe 75% of the water? I just got this acct so it won't look bad on my part if I tell my customer he needs to drain more water.
    If you hit 100 at 50/50 - try 1/3 pool water and 2/3rd's tap water and verify that you come in somewhere around 30-35. Multiply the result by 3 and see where you are. I'm afraid if you hit 100 with 50/50 it could be worse than 100 still. Absolute accuracy of the test is low (+/- 15ppm with undiluted samples), but better than guessing.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
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    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
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    Mod Squad jblizzle's Avatar
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    Re: CYA above 140

    That means you could be anything over 200ppm. I would say at least another 75% water change needs to be done. You could try the test again with 2/3 tap and 1/3 pool water and triple the reading, but you are loosing a lot of accuracy.

    UWV a little faster ... this time
    Jason, TFP Moderator
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    UnderWaterVanya's Avatar
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    Re: CYA above 140

    Quote Originally Posted by jblizzle
    UWV a little faster ... this time
    Luck - just pure luck!
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

  10. Back To Top    #10

    Re: CYA above 140

    ok I'll head back there today and I'll use my colorQ pro 7 on this test.
    14,000 Gal. In-Ground Plaster Salt Water Pool
    Pentair IntelliFlo VS Pump
    Cartridge Filter
    Aqua Rite Chlorine Generator w/ T-Cell-3
    6-panel Solar Heater
    Purex Triton MiniMax Plus 400 Gas Heater
    Built 1999

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    Mod Squad jblizzle's Avatar
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    Re: CYA above 140

    How was the last test done? I am not sure how well the colorQ does on CYA (there are many reports in the forum about it). I would stick to the turbidity test that came with the K2006 (although I am guessing you are out of reagent since it comes with so little).

    You can get refills from tftestkits.net that are much larger.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  12. Back To Top    #12

    Re: CYA above 140

    I used the Taylor K2006
    14,000 Gal. In-Ground Plaster Salt Water Pool
    Pentair IntelliFlo VS Pump
    Cartridge Filter
    Aqua Rite Chlorine Generator w/ T-Cell-3
    6-panel Solar Heater
    Purex Triton MiniMax Plus 400 Gas Heater
    Built 1999

  13. Back To Top    #13

    Re: CYA above 140

    Ok now with 1/3 pool water 2/3 tap water I get a reading of 50 ppm

    14,000 Gal. In-Ground Plaster Salt Water Pool
    Pentair IntelliFlo VS Pump
    Cartridge Filter
    Aqua Rite Chlorine Generator w/ T-Cell-3
    6-panel Solar Heater
    Purex Triton MiniMax Plus 400 Gas Heater
    Built 1999

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    UnderWaterVanya's Avatar
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    Re: CYA above 140

    Quote Originally Posted by Keepinitclean
    Ok now with 1/3 pool water 2/3 tap water I get a reading of 50 ppm
    Then it is likely you are close to a CYA level of 150ppm.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

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    Mod Squad jblizzle's Avatar
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    Re: CYA above 140

    Taylor or colorQ? Mixing the results between the 2 test might get confusing.

    Taylor using 50/50 = 100*2 = 200ppm
    ? using 33/66 = 50 * 3 = 150ppm

    If it was Taylor, I think a 75% change is in order as you are likely between 150-200.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  16. Back To Top    #16

    Re: CYA above 140

    I used the Taylor on all the test for this pool

    Looks like I will be draining 75% of the pool. I don't see how a pool guy could have let it this high. Thanks for your help and the fast response time.
    14,000 Gal. In-Ground Plaster Salt Water Pool
    Pentair IntelliFlo VS Pump
    Cartridge Filter
    Aqua Rite Chlorine Generator w/ T-Cell-3
    6-panel Solar Heater
    Purex Triton MiniMax Plus 400 Gas Heater
    Built 1999

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    UnderWaterVanya's Avatar
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    Re: CYA above 140

    Quote Originally Posted by Keepinitclean
    I used the Taylor on all the test for this pool
    Just for grins - might be worth taking ColorMote tests at 100% pool water, 50/50, and 1:2 ratio's to see how closely it parallels the CYA test in the Taylor kit.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

  18. Back To Top    #18

    Re: CYA above 140

    Ok I might be going back tomorrow to drain the pool. I'll take it then and post it up...Thanks again!!
    14,000 Gal. In-Ground Plaster Salt Water Pool
    Pentair IntelliFlo VS Pump
    Cartridge Filter
    Aqua Rite Chlorine Generator w/ T-Cell-3
    6-panel Solar Heater
    Purex Triton MiniMax Plus 400 Gas Heater
    Built 1999

  19. Back To Top    #19
    Mod Squad jblizzle's Avatar
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    Re: CYA above 140

    Quote Originally Posted by Keepinitclean
    I don't see how a pool guy could have let it this high. Thanks for your help and the fast response time.
    What exactly are your plans here? Just clear it once? Perform weekly service? Perform daily service?

    It is not uncommon for pool services to elevate the CYA to around 100ppm (or more) intentionally. This is because they only show up once a week (or sometimes every 2 weeks here). They come and jack the FC WAY high, and need the higher CYA level to protect it from the sun so it does not drop too much before they show up again in 7-14 days. They just hope the the FC stays high enough that the pool does not turn green before they come back (although it may have dropped lower that we would recommend). Then they shoot the FC way high again which kills off anything that may have started to grow and the hope they are good in 7-14 days again.

    This forum is more about daily maintenance for pool owners. If you are looking to do weekly service, you may need to adjust some of the recommendations found here.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: CYA above 140

    I just took over two weeks ago for monthly service. I show up once a week.

    So having a high CYA level won't harm the pool in any way? and since I show up once a week I should leave it at that level?
    14,000 Gal. In-Ground Plaster Salt Water Pool
    Pentair IntelliFlo VS Pump
    Cartridge Filter
    Aqua Rite Chlorine Generator w/ T-Cell-3
    6-panel Solar Heater
    Purex Triton MiniMax Plus 400 Gas Heater
    Built 1999

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