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Thread: New here. Best approach to high CYA

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    New here. Best approach to high CYA

    Have visited site often and joined today
    Bought a testing kit to confirm pool store analysis.
    Have removed tab floater 4 weeks ago due to high CL and low ph
    tested today
    CL 5+ had been higher have not added any in 4 weeks; Ph 7.2 had been lower; FC 11 CC 1 TC 12 and CYA 300.
    On CYA diluted sample to 1/3 pool and 2/3 tap water and it registered 100, 3x = 300
    pool store had said 150, but I think that is their top end.

    What is best approach? Drain pool and refill? Treat? Saw an ad for reverse osmosis service for poll? Other?
    40k Pebble Pool with Spa Spillover
    (2) Hayward Pro-grid 6020 DE filters
    (2) Hayward pumps 1.5 hp, 1.60 sf, 2.4 thp
    Hayward H series
    TF-100 test kit

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    linen's Avatar
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    Re: New here. Best approach to high CYA

    Welcome to tfp, Nixid

    Normally the best way is to do a partial drain/refill but since you live in AZ one of the few place that has companies offering Reverse Osmosis pool treatment, you could also look into that. RO treatment will remove cya and other dissolved solids such as CH.

    At 300 ppm you will have to drain most of you pool to get down to the recommended 50 ppm.
    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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    Mod Squad woodyp's Avatar
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    Re: New here. Best approach to high CYA

    Drain and fill, or partially drain 3 times and fill is the only DIY method. Welcome to the forum.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    Modawg2k's Avatar
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    Re: New here. Best approach to high CYA

    A company here in Phoenix quoted me a minimal of $545 with the possibility of more if total dissolved solids were above a certain point.
    ~15k gallons, 3'-5'-4' Figure 8 Shape In Ground
    Wetedge Satin Matrix Interior (Pebble)
    Paramount In-floor System
    Pentair IntelliFlo VS 3050, Pentair Triton II TR100 Sand Filter
    Pentair Intellichlor IC40 SWG

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    Re: New here. Best approach to high CYA

    With water seeming to average about $5/1000 gal around the country, R/O does not seem like a worthwhile option.

    Replacing OP's entire pool might be around $200-300 with a series of drain/refills.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: New here. Best approach to high CYA

    Forgot to ask if anyone thought that high CYA could cause some of the pebbles, from the pebble tec, to come loose. If not the high cya what else, seems to be a recent problem.
    40k Pebble Pool with Spa Spillover
    (2) Hayward Pro-grid 6020 DE filters
    (2) Hayward pumps 1.5 hp, 1.60 sf, 2.4 thp
    Hayward H series
    TF-100 test kit

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    Re: New here. Best approach to high CYA

    15000 gallons here would probably be about 500 bucks delivered. I am in PA not real sure what your water costs. Have a feeling though it is possibly considerably more expensive.

    If it would be even as far as costs I would consider RO. If draining water and delivery is cheaper I would go that route, depending how long to RO process took. If RO takes a considerable amount of time, even if it were less expensive I would consider drain and refill ~ I have a very short swim season though, so that's a factor to me, but probably isn't one for you.
    AGP: 27' x 52" : 17,500 gallon
    300 lb. Sand Filter (75 gpm) / 1.5 hp pump
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    Re: New here. Best approach to high CYA

    Drained and filled pool, thought I would share that water cost $341.01 for the month, 75,000 gallons.
    40k Pebble Pool with Spa Spillover
    (2) Hayward Pro-grid 6020 DE filters
    (2) Hayward pumps 1.5 hp, 1.60 sf, 2.4 thp
    Hayward H series
    TF-100 test kit

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    Re: New here. Best approach to high CYA

    Drained and filled pool, thought I would share that water cost $341.01 for the month, 75,000 gallons.
    That might mislead the casual reader. Assuming you drained entire pool (although 80% would've been fine) that means your CYA is now zero and the water cost for 40,000 gallons was $182.00 or so...correct?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: New here. Best approach to high CYA

    Yes drained whole pool and your math is right.
    40k Pebble Pool with Spa Spillover
    (2) Hayward Pro-grid 6020 DE filters
    (2) Hayward pumps 1.5 hp, 1.60 sf, 2.4 thp
    Hayward H series
    TF-100 test kit

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    Re: New here. Best approach to high CYA

    Quote Originally Posted by Nixid
    Forgot to ask if anyone thought that high CYA could cause some of the pebbles, from the pebble tec, to come loose. If not the high cya what else, seems to be a recent problem.
    I could see low pH etching the plaster around the pebbles, causing them to come loose. CYA presence in the water wouldn't cause it, exactly, although as you said earlier, the lower pH could have come from the tablets you had in the floater.
    Outdoor 14,000 gallon IG plaster pool built in 2000 with spillover spa, 2 hp WhisperFlo pump with MagneTek motor, Sta-Rite cartridge pool filter with 300 ft2 filtration area and 0.33 gpm/ft2 filtration rate, Aquabot Rapids 4WD robotic pool cleaner, Raypak digital gas heater, and Intermatic mechanical timer located in the Dallas-Fort Worth metroplex

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