Lowering CYA

[Jmerich]

First, I want to say I am so thankful I found this board! I love learning how to be in control of my pool!!

My CYA is high, about 110. I bit the bullet and am doing a partial drain today. My handy husband (who by the way is clueless about the chemical balance since that is my job) hooked up some PVC so I am using the drained water to soak my lawn hopefully the chlorine doesn't hurt my lawn.

I have switched away for TriChlor to liquid. I still have lots of tabs left. How much CYA is released per tab? If I let them sit around and use them slowly over the next 6-12 months won't they lose their potency? I'm wondering if I can leave 1 puck in the floatie just in case the chlorine level drops?

Thanks!

 

[pwrstrk]

Congrats on your new found knowledge and becoming a BBB 'er. You can use the pool calc, effects of adding chemicals. to answer you questions.


Sent from my iPhone using Tapatalk.

 

[Smykowski]

Keep them dry and they'll last forever. As for CYA per puck, scroll all the way to the bottom of the pool calculator. Each puck will be either 7 or 8 oz.

 

[linen]

If they are 3 in tabs (about 8 oz) then they each one will add about 1.8 ppm cya to your 18000 gallon pool. I used the "effects of adding chemicals" section near the bottom of the poolcalculator.com. They also lower ph and TA.

If you keep them dry, they should last a long time.

I see no reason to keep one in a floatie if you are testing and dosing daily with bleach/liquid chlorine. Save the pucks for vacations (and make sure you watch your cya when you use them).

 

[woodyp]

You can use the pool calculator to see how much tabs "put out". Usually about 60% of the chlorine amount they do. Keep them in the plastic bag inside the screw lid plastic container and they'll keep a loooooong time. One puck in a floater won't kill ya' if you just have to until you wean yourself!

 

[Jmerich]

Thanks everyone. I didn't realize the pool calculator would show me the calculation.