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Thread: CYA testing Chemicals

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    Mark R's Avatar
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    Question CYA testing Chemicals

    My CYA use to be about 70, I tested it today and it shows < 30. Is it possible it has dissipated, no rain to think of as I live in the desert. It's been about 2 years since I filled my pool and used stabilizer from big box store to bring it up to 70. I do top it off a lot during the last 2 summers.

    Is it possible my R-0013 is old and not good anymore ? Or is it just naturally gone ? I use liquid 10% bleach to sanitize. Also maybe a gallon of acid every 2 weeks to keep it 7.2-7.6

    Thank you
    12k gal Gunite/Hayward filter C5520BH with quad 33 inch filters. 2.5 hp motor. Pool is on south side, so full sun light. Spill over spa.
    Laar's heater LT250-Low NOx Gas Fired for pool/spa 250,000 BTU. Roof mount 6 panel solar system installed east/south. TF-100 test kit. May-September 100+ degrees out side.

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    triptyx's Avatar
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    Re: CYA testing Chemicals

    There are only two ways to get rid of CYA:
    1. Drain and replace water. Evaporation doesn't count - you need to either backwash or pump water out of the pool and replace it with fresh water.
    2. Algae can sometimes convert CYA to ammonia.

    How old is your CYA reagent in your testing kit?
    8,500gal plaster in-ground with attached spa, two floor drains, one skimmer. Chlorine, City Water.
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    Texas Splash's Avatar
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    Re: CYA testing Chemicals

    UNLV fan are we Mark? The R-0013 should hold-up for a good season or two if stored in a cool/dry place away from light. When was the last time you tested CYA other than today? Last season perhaps? Adding water after evaporation doesn't change the existing CYA level, and CYA won't "typically" disappear from water, although a very small amount can become consumed each month (3-5 ppm). So if you haven't tested CYA since last season (let's say Aug-Sept), I think it's fair to say you could conceivably have lost about 30-40 ppm just through normal expenditure/oxidation process. Add to that the "/- 15 ppm variance for CYA testing and it sounds like you may just need to add some more.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Administrator Leebo's Avatar
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    Re: CYA testing Chemicals

    To me it sounds like you've lost a good bit from splashout. Think of all the water you've replaced from the kids doing cannonballs, water fights, and so forth. Losing 30ppm over two years sounds completely normal to me.

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    Mark R's Avatar
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    Re: CYA testing Chemicals

    I would say regent is 2 years old. It's kept in the laundry room, cool and dark area..

    First time checking it this year, last time was April 2015

    Ill go ahead and add like a 1lb more of new stabilizer. I've never had alge.

    Yes, I'm a UNLV FAN

    Thanks for quick responses :

    EDIT: no kids or splash out to speak of.
    12k gal Gunite/Hayward filter C5520BH with quad 33 inch filters. 2.5 hp motor. Pool is on south side, so full sun light. Spill over spa.
    Laar's heater LT250-Low NOx Gas Fired for pool/spa 250,000 BTU. Roof mount 6 panel solar system installed east/south. TF-100 test kit. May-September 100+ degrees out side.

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    Mark R's Avatar
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    Re: CYA testing Chemicals

    Added about 1.5 pounds of CYA I bought from Walmart today. I'll check it in 3 days and recheck in a week. I'm hoping it'll be at 60-65... If no movement with the dot test I'll order more of the clear liquid you put in the Little container that you shake and pour into the cylinder with the dot.

    Water is pretty salty, I guess that's a by product of using bleach ? I plan on doing a drain next spring, I know my CH is totally out of wack (950-1000 ) due to the water around here. I guess every 3 years I'll do a drain. Wife doesn't like the salt flavor.

    EDIT: 1 other thing while I was at Walmart is that I saw Walmart liquid 10% sanitizer in the pool section for like 3.95 a gallon. I didn't think that was a great deal so I bought 10 Walmart brand household bleach 8.25% for like 2.75 a gallon. I hope that was the cheaper way to go. I couldn't find that app that breaks down bleach % by the ounce..


    DOUBLE EDIT: I just found the conversion calculator on the bleach, not a huge savings but I save a little buying the 8.25% at the lower price.
    12k gal Gunite/Hayward filter C5520BH with quad 33 inch filters. 2.5 hp motor. Pool is on south side, so full sun light. Spill over spa.
    Laar's heater LT250-Low NOx Gas Fired for pool/spa 250,000 BTU. Roof mount 6 panel solar system installed east/south. TF-100 test kit. May-September 100+ degrees out side.

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