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Thread: Bad CYA????

  1. Back To Top    #1

    Join Date
    May 2010
    Location
    SW Georgia
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    298

    Bad CYA????

    I started the season with a CYA of 30. On 3/21 while trying to get to 50/60 CYA I put in 4lbs. and it moved to 40 after a week then dropped back to 30 a few weeks later. On 4/19 I purchased 4 more lbs. and put in 2lbs. on 4/13 and 2lbs. on 4/20. Today my CYA is between 30 and 40. My TA has shot from 60 to 100 and I would guess that is due to the CYA addition. While I did have to drain around 6 to 7 inches off due to excessive rain fall in late March I would not have thought that that would have made that big a difference in my CYA readings. I can also tell my CYA is low due to the increased chlorine usage. I have never had this problem with CYA from Pinch A Penny. These last two batches came from their competitor.

    My question is what has caused this problem? Bad CYA? Bad Math (me)? Water drain off? Test Accuracy?

    FC 8
    CC 0
    TA 100
    PH 7.5
    CYA 30/40
    35K IG Vinyl 20 x 40 self built pool, Hayward Pro Series High-Rate Sand Filter 31" 98gal/min, Hayward TriStar 1.85hp, Hayward 400btu heater, BBB method w/Hypo, Jazz light w/matching fiber optic rope lighting around coping w/syncronized color wheels. Concrete Paver deck.

  2. Back To Top    #2
    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    Re: Bad CYA????

    If the CYA raised and then dropped it wasn't bad. Do you have an autofill?
    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
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    Isaac-1's Avatar
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    Re: Bad CYA????

    Are your test reagents old, have they been exposed to freezing conditions?
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
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  4. Back To Top    #4

    Join Date
    May 2010
    Location
    SW Georgia
    Posts
    298

    Re: Bad CYA????

    I do not have an auto fill. I just finish the large bottle of CYA reagent, I need to order more. The reagent stays in the pool house which is not heated so maybe there is a slight possibility that it froze. Part of me wants to say that the test was ok due to the fact that I am experiencing more daily demand for chlorine? Once I re-order supplies I will validate the original test results.
    35K IG Vinyl 20 x 40 self built pool, Hayward Pro Series High-Rate Sand Filter 31" 98gal/min, Hayward TriStar 1.85hp, Hayward 400btu heater, BBB method w/Hypo, Jazz light w/matching fiber optic rope lighting around coping w/syncronized color wheels. Concrete Paver deck.

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