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Thread: New Pool Chemistry Question

  1. Back To Top    #1

    New Pool Chemistry Question

    Our new plaster pool is puzzling the **** out of me.....

    Water tests as of Sunday:
    FC - 1.5
    pH - 7.2
    TA - Was at 40, so I added some baking soda to bring it up per the calculator. I haven't retested this yet.
    CYA - 80

    We are using a rainbow feeder for now. I am running our pump from about 8PM till 6AM.
    I usually test the water in the morning, sometimes in the evening.
    It has been RIDICULOUSLY hot and dry....temps in the 100's with no rainfall to speak of.
    Water temp as of last night was right about 93 (yuck).

    I tested the water yesterday evening, and the FC was down to 0 (ph @ 7.2). I turned the Rainbow up a notch from 3 to 4, and dropped a couple of pucks in the skimmers and overnight the FC shot up to 4. I took one of the two pucks out of the skimmer this morning.

    Questions:
    1) Do I/should I continue to leave a puck in the skimmer? 1 or two?
    2) Should I run a pump turnover during the day?

    We have no issues with algae or water clarity, the pool looks great, but these numbers are a little worrisome.

    Any tips?

    Thanks!
    IG ~12,500 gallon, Hayward Cartridge Filter, Wetedge Luna Quartz plaster (Pacific/Aruba), Pool Pump: 1.0 HP Tristar by Hayward, Waterfall Pump: 1.0 HP Super II by Hayward

  2. Back To Top    #2
    JasonLion's Avatar
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    May 2007
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    Re: New Pool Chemistry Question

    How old is the plaster? For the first three weeks you should not adjust TA or CH and focus mostly on keeping the PH down. Run the pump 24/7, brush twice a day, and keep one or two tablets in the skimmer. After about three weeks you can switch over to maintaining things normally, aside from continuing to keep an eye on the PH.

    It seems remarkably unlikely that CYA is really 80. What CYA test did you use?
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Re: New Pool Chemistry Question

    Quote Originally Posted by JasonLion
    How old is the plaster? For the first three weeks you should not adjust TA or CH and focus mostly on keeping the PH down. Run the pump 24/7, brush twice a day, and keep one or two tablets in the skimmer. After about three weeks you can switch over to maintaining things normally, aside from continuing to keep an eye on the PH.

    It seems remarkably unlikely that CYA is really 80. What CYA test did you use?
    Plaster was done on 6/28.
    The CYA test was done @ Warehouse Pool Supply.
    I have the TF Kit, but haven't ventured much past the FC and pH part of the testing.
    IG ~12,500 gallon, Hayward Cartridge Filter, Wetedge Luna Quartz plaster (Pacific/Aruba), Pool Pump: 1.0 HP Tristar by Hayward, Waterfall Pump: 1.0 HP Super II by Hayward

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: New Pool Chemistry Question

    Alright, you are more than a month, so you need to adjust TA and CH levels. It sounds like you already started working on TA. Do you have a CH test result?

    The CYA test in the TF100 will give you much better results than getting a CYA test at a pool store.

    Your FC level is too low, especially if CYA is anywhere near 80. I still doubt the CYA test results, but you should bring your FC level up to at least 5 while working on getting a better CYA test result.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  5. Back To Top    #5

    Re: New Pool Chemistry Question

    Quote Originally Posted by wamaha
    Our new plaster pool is puzzling the **** out of me.....

    Water tests as of Sunday:
    FC - 1.5
    pH - 7.2
    TA - Was at 40, so I added some baking soda to bring it up per the calculator. I haven't retested this yet.
    CYA - 80

    We are using a rainbow feeder for now. I am running our pump from about 8PM till 6AM.
    I usually test the water in the morning, sometimes in the evening.
    It has been RIDICULOUSLY hot and dry....temps in the 100's with no rainfall to speak of.
    Water temp as of last night was right about 93 (yuck).

    I tested the water yesterday evening, and the FC was down to 0 (ph @ 7.2). I turned the Rainbow up a notch from 3 to 4, and dropped a couple of pucks in the skimmers and overnight the FC shot up to 4. I took one of the two pucks out of the skimmer this morning.

    Questions:
    1) Do I/should I continue to leave a puck in the skimmer? 1 or two?
    2) Should I run a pump turnover during the day?

    We have no issues with algae or water clarity, the pool looks great, but these numbers are a little worrisome.

    Any tips?

    Thanks!
    You need to run the pump during the day during the summer to avoid the algae. The puck in the skimmer will increase the FC because its basically unregulated.

  6. Back To Top    #6
    Mod Squad Bama Rambler's Avatar
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    Jun 2009
    Location
    SouthWest Alabama
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    22,337

    Re: New Pool Chemistry Question

    No need to run the pump during the day if you don't have clarity or FC problems. I'd stop using the pucks altogether with a CYA of 80. You're CYA is already too high unless you have a swcg.
    We really need a set of test results from the TF-100. With that we can tell more what's going on.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  7. Back To Top    #7

    Re: New Pool Chemistry Question

    Thanks guys. I will do the full test this weekend and post the results.
    IG ~12,500 gallon, Hayward Cartridge Filter, Wetedge Luna Quartz plaster (Pacific/Aruba), Pool Pump: 1.0 HP Tristar by Hayward, Waterfall Pump: 1.0 HP Super II by Hayward

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