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Thread: Low Low CYA

  1. Back To Top    #1

    Join Date
    Sep 2007
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    Mobile Alabama
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    Low Low CYA

    I tested twice to be sure with the TF-100 and both times less than twenty. Emptied the entire bottle of reagent mixture and the dot was just as clear as can be. Last time I checked it was 30....that was just a couple months ago. We have got alot of rain. It never crossed my mind to watch this.

    Back to the problem...Low if any cya. I've seen BECAREFUL if cya is truly zero numerous times. The pool calc tell me I need 16 lbs! What do I need to do and what is the hazards of no cya?

    Jason and Waterbear...I'm still working getting the copper down and adding bleach slowly. Still at .5 ppms copper.

    I'm getting my water ready for the SWG system.

    Getting it balanced and adding borates.
    16x36 vinyl
    300 lb sta-rite sand filter
    3/4 hp sta-rite pump
    Aquarite SWG

  2. Back To Top    #2
    JasonLion's Avatar
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    Re: Low Low CYA

    If CYA is really zero you use much lower FC levels. But your CYA level is presumably at least a little above zero. So things are basically normal except you will lose almost all of your FC to sunlight each day.

    I suggest adding some CYA and checking to see if you are having water replaced somehow. One common way that happens is a leak combined with an autofill system.
    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

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    frustratedpoolmom's Avatar
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    Re: Low Low CYA

    16 lbs? HOW BIG is your pool?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  4. Back To Top    #4

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    Mobile Alabama
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    Re: Low Low CYA

    23,000 gals
    Does that seem WAY too much to add? The pool calc said for 0 cya going to 80ppms would require a little over 15 lbs. I'm going to add a little acid to atleast get a base line like Jason mentioned.
    16x36 vinyl
    300 lb sta-rite sand filter
    3/4 hp sta-rite pump
    Aquarite SWG

  5. Back To Top    #5
    JasonLion's Avatar
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    Re: Low Low CYA

    You don't want to take CYA all the way to 80 in one shot. Don't add more than 10 lbs of CYA at first, give it a week and see where you are. If you add too much it is very difficult to correct and the measurements/calculations are never exact.
    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

  6. Back To Top    #6
    frustratedpoolmom's Avatar
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    Re: Low Low CYA

    Quote Originally Posted by stanton
    23,000 gals
    Does that seem WAY too much to add? The pool calc said for 0 cya going to 80ppms would require a little over 15 lbs. I'm going to add a little acid to atleast get a base line like Jason mentioned.
    I agree with Jason, don't go for the 80ppm target all at once....ALso, adding that much CYA all at once (which is an acid) may have an affect on your PH so keep an eye on that too.....
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  7. Back To Top    #7

    Join Date
    Sep 2007
    Location
    Mobile Alabama
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    Re: Low Low CYA

    Thanks guys. I've added 6lbs over the week. I'm up to 30 ppms now. But the last time I added the acid ran into another problem with the filter.lol I think I found the problem on that. Thanks for all the help.
    16x36 vinyl
    300 lb sta-rite sand filter
    3/4 hp sta-rite pump
    Aquarite SWG

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