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Thread: CYA Question

  1. Back To Top    #1
    carlos31820's Avatar
    Join Date
    Nov 2010
    Midland, Georgia

    CYA Question

    This is my first season as a pool owner. I've been testing my water with the TF-100 kit. The weather here in west-central Georgia is quite hot. All season, I've been keeping a CYA level of about 50 (as was recommended by my SWG manual). With a CYA of 50, I had my SWG set at 60% with a pump run time of 12 hours. This was maintaining the FC between 4.5-6.0 depending on conditions.

    About 4 weeks ago, I bumped up the CYA to 70 and lowered the pump run time to about 10 hours. Curiously, for the past couple weeks, the FC has been hovering around 7.0-9.0. About 2 days ago, I lowered the SWG to 40% to try to keep it back in that 4.5-6.0 range but the water just tested with a level of 8.5. I'm using the DPD test to test FC/CC. CC has been at zero all season.

    My question is whether the change in CYA from 50 to 70 is the reason why the pool seems to be able to maintain such higher FC levels with a decrease in pump run time.
    16x36 Vinyl Pool - 22.5K gallons.
    Jandy Stealth 1hp pump - Jandy CS-150 filter
    Jandy Legacy 250k heater - Jandy Ei SWCG
    Jandy Watercolors LED light
    Paramount Vanquish in-floor cleaner

  2. Back To Top    #2
    frogabog's Avatar
    Join Date
    Jul 2010
    Portland, Oregon

    Re: CYA Question

    Yep! That's why we recommend 70-80ppm CYA around here. Despite what the mfr's say.

    Your cell will last longer too. Win win for everyone (except the cell mfr's). Yay for CYA (it's not so evil we can't give it some love every once in a while eh?).
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

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