What to do first? CYA > 200 ppm

[PoolLizard]

Well, water is flowing. Started about 15 mins ago. I talked to a Water Co rep this morning. She said it would cost between $80 to $100 to refill. I think she's a little on the low side, but at least her estimate wasn't horribly high either.

[PoolDoc]

Good deal.

[PoolLizard]

Had some black algae spots on the bottom of the pool. Removed them with a wire brush. Refill is now in progress.

[PoolDoc]

Sounds good.

[PoolLizard]

Pool is about 1/3rd to 1/2 full. I poured in one 96 oz jug of (?)% store bought bleach. I know, there's no CYA in the water yet, but with these high outside temps (98 at the moment, and going up), I just wanted to get at least some chlorine in the water. I swished the water all around with my pool brush.

[PoolDoc]

Best time to add chlorine -- ESPECIALLY on a pool with low CYA -- is in the late evening.

[PoolLizard]

Best time to add chlorine -- ESPECIALLY on a pool with low CYA -- is in the late evening.

Understand, point well taken.

[PoolLizard]

Well, refill almost complete. Water level has about 8 inches to go.

I have my Bleach, Borax, and Baking Soda ready. As soon as the water gets up to skimmer level I'll get the pump primed and going, then I'll test the water to see where it's at.

So, what do you recommend I do first at that point?

From what I've read, I should first put some cyanuric acid in a sock and drop that in the skimmer basket. I'm thinking I should first shoot for a CYA level of 30. I will let the PoolCalculator figure out how much acid to put into the sock. Then I'll add chlorine AS IF the CYA was already at 30. That means a FC level of 4.

Then I'll adjust the TA and pH. My fill water has a pH of 7.7 and a TA of 90. So, I'm thinking that I'll probably have to lower the pH just a little.