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Thread: New pool surface and new water

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    Join Date
    Jul 2014
    Location
    CINCINNATI, OH
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    8

    New pool surface and new water

    I recently had my pool resurfaced using Diamond Brite as my finish. My Pool was filled just over one week ago with water hauled in from the local aquafer..(all $780 worth.) I added two gal of liquid shock while filling. And added two additional gallons a few days later. About three days later,I installed my new DE filer system which included a Pentair inline chlorinator the uses h 3" trichlor pucks. Which I seen no harm in using initially because my new water should not contain any CYA. I filled my chlorinator wih 5 pucks ( it holds 11, I believe) an set the feed on 3 which is about half strength. After circulating for about 4 days. I took readings with my TF 100. results: Chlorine 0, PH >8.2, Ca hardness 325, Total Alk 290, CYA ???? Dot never became invisible. Later that evening, I added 2 gal of liquid shock to see if it would hold over night. The next morning my readings were: free chlor 5.5, combined chlor0.5, PH still > 8, total alk still near 290, CYA the dot still never went away. Reading two days later which was this morning: No chlorine present, PH >8, Total Alk > 200, CYA dot still visible as tube ran over???????.

    OK, I'm not sure if the water from the aquafer was extremely alkaline to begin with or if the Diamond Brite curing process adds to the issue. Regardless, I figure I can fix that problem with acid, aeration and time. But what perplexes me is the CYA level. Am I getting false CYA readings due to other issues with new well water? By the way, the water is crystal clear and has been since day one.
    27K Gal Klimat Master Gunite installed in 1981, New Diamond Brite finish applied 7/2015, Pentair Quad DE filter with 1 1/2 hp Pentair Superflo VS pump , TF-100 kit.

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    Mod Squad jblizzle's Avatar
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    Re: New pool surface and new water

    Is there a reason you are not lower the pH back into the 7s every time you test?!?!?

    Have you started using PoolMath?
    Even if the 5 pucks have completely dissolved, they would only have added 6.2ppm of CYA ... so of course that is not showing up on the test. This is why we recommend adding stabilizer directly up to around 20-30ppm and then you can use the tablets to keep raising it if desired.

    I would fill the entire chlorinator and crank up the output so you start maintaining a FC reading and get the CYA into the water.
    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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  3. Back To Top    #3

    Join Date
    Jul 2014
    Location
    CINCINNATI, OH
    Posts
    8

    Re: New pool surface and new water

    Ok, my bad. For some reason, I was thinking that the high CYA level marks were at the top of the tube instead of the bottom; so when I filled it up and the dot was still there, I thought it was off the charts... next time I'll use my glasses .As far as the PH and alkalinity, I was reluctant to move too quickly due to the new surface, After reading the start up instructions for the Diamond Brite, it really doesn't mention the addition of acid to the water so I should be good to go as long as I do it slowly. Thanks again.
    27K Gal Klimat Master Gunite installed in 1981, New Diamond Brite finish applied 7/2015, Pentair Quad DE filter with 1 1/2 hp Pentair Superflo VS pump , TF-100 kit.

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