AG Pool Closing with High CYA

[FormerBromineUser]

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I think Watermom actually answered that question. It might have gotten missed with the TA recommendation. You asked:

Should I really increase Chlorine levels to around 25 ppm?

Her reply was:

Yes. With a CYA that high, the high chlorine levels won't hurt a thing. It is no different than having a pool with no CYA and a chlorine of 1-3ppm. I would also suggest bumping your pH up to around 7.8 or 7.9 to give it some wiggle room over the winter without dropping below 7.0.

(How you didn't have algae with a FC that low, I don't know! You have some luck!)

Did you have any other questions?

[bottomcat]

I guess I'm all set. Since I wasn't clear in my OP that I was not trying to clear up algae, and since Watermom's sticky is addressing algae, I wanted to make sure I had it right. I was looking for clarification between "it won't hurt" and "it is recommended." I'll just bring it up to around 25ppm (496 oz of 8.25% bleach!) and be done with it. Thanks all.

[FormerBromineUser]

Perfect! Yea, sometimes things get combobbled on threads. Good luck!

A piece of advice, open early. When you think the water temperature may be close to 60 degrees, open. Take a full set of readings and post them. We will especially want to see your new CYA reading.

You are not a subscriber, so unless you update that, you may have to wait for an answer on recommendations. If so, raise your FC right away and use your best judgement on the rest. Better yet, become a subscriber! You can go to the settings tab, then my account, then subscriptions. A minimum of 14 bucks gets you priority attention.

[bottomcat]

Okay, I opened the pool yesterday. Here are the readings:

FC: 3.2 ppm
CC: 0 ppm
pH: 7.8
TA: 120 ppm
CH: 60 ppm
CYA: 45 ppm

The CYA is down mostly to the fact that I had about a 50% water loss over the winter (heavy snow & ice load) and replaced with tap water.

[FormerBromineUser]

How does the water look?

[bottomcat]

It looks crystal clear! No signs of algae or anything.

[FormerBromineUser]

Excellent. May I assume you raised that FC to the high-end of your FC/CYA ratio? Like about 6?