Winter closing IG BBB Safety Cover - Best Chemical Balance prior to closing?

[blue wolverine]

My first post. I use BBB. My pool is inground cement with epoxy paint over concrete. I use BBB method. Well Water, some iron. This year have only added CYA in the spring, liquid bleach 12 %, and muriatic acid to lower ph.

My pool is approx 28x18 inground kidney shaped.

Current CYA 30, Chlorine shock level, PH 7.8 Calcium 140 Water 75F

I will be closing next week, putting on solid safety cover.

Finally the question,

What is the best chemical level prior to closing?

[PoolDoc]

With iron laden well water, there are a number of issues you need to address.

Please complete the Pool Chart; it makes it MUCH easier to answer questions well:

Pool Chart Entry Form

I'll check back this evening.

[blue wolverine]

I have done the chart.

I actually did out before I started the thread, but I have just done out again. re: the iron in my we'll water, I do not have rust stains in my pool. I have had high ph all summer but we have had almost no rain.

thx for your help

[PoolDoc]

Please note the corrected gallons figure, based on the dimensions you supplied. Kidney volume is always a bit of a guess, but the volume shown is for 90% of an enclosing 18x28 rectangle.

You didn't list your TA level, but you probably want to have your TA between 100 and 130 ppm, and your pH a bit lower.

But, the real key is making sure nothing grows -- if you get slime or algae growing, your chemistry will change, no matter what you set it at now.