Cya in the sun

vbertone · May 22, 2016

Almost sounds like a folk song...lol. So I am guessing since the north east area has yet to see sun for more than two days straight, my cya is higher. And I know it's bad to use the tri-Chlor tabs but I have a big bucket of them so I am using them up.

When the sun returns the cya will most likely go down? And fc will come down as well since it won't have to be so high?

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JoyfulNoise · May 22, 2016

UV loss of FC isn't the issue with high CYA. CYA acts as a chlorine buffer in that it binds the chlorine and lowers the active chlorine levels. So when your CYA is high, your hypochlorous acid concentration will fall well below the level needed to control algae.

So, even in the absence of sunny days, high CYA will cause you huge problems if you don't keep your FC at the recommended FC/CYA ratio. Adding more CYA everyday with pucks makes the appropriate level a moving target.

vbertone · May 22, 2016

Well cya at 70 now and my fc was only at 4. But we have had two days so far of non stop rain. So it's not terrible yet but higher then it was. I am going to pick up some bleach today so I can keep my fc higher.

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Divin Dave · May 22, 2016

CYA only comes down with dilution. The sun does not lower it CYA.
Continuing to use the trichlor is going to lead to problems down the road.

duraleigh · May 23, 2016

+1 what Divin Dave said.....stop using the pucks. They won't be wasted (they last forever) but you really should stop using them now.

vbertone · May 23, 2016

Understood but then without an auto chlorinator for the liquid, am I just pouring freely bleach by the skimmer?

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Texas Splash · May 23, 2016

Vinny, don't pour the bleach directly in the skimmer. Pour it slowly near the return jets. That's the best way for mixing and dilution into the water. Use regular bleach (generic is fine) - but no scented bleaches or splashless stuff.

vbertone · May 23, 2016

Texas Splash said:
Vinny, don't pour the bleach directly in the skimmer. Pour it slowly near the return jets. That's the best way for mixing and dilution into the water. Use regular bleach (generic is fine) - but no scented bleaches or splashless stuff.

Will do, we are having our first pool party this weekend so want to make sure all is good. Thanks

pooldv · May 23, 2016

Here is a handy page on how to add chemicals to your pool, Pool School - Recommended Pool Chemicals