How much borax?

[Rangeball]

Bleach calc doesn't figure it apparantly.

21,200 gallon pool. My alk is down to 110, PH holding steady at 7.1 for several days now during and after vigorous aeration. I'd like to bump PH at least .2.

How much borax do I need?

[poolrx]

"My alk is down to 110" Not sure if you mean this as a good or bad thing but 110 is good(assuming good b/c of aeration). I usually add about 2 to 3lbs to go from 7.2 to 7.4 or so. I have had to add a bit more this year b/c of all of the rain though.

[aylad]

I would start with about 1/2 of a grocery-store sized box, give it a couple of hours to circulate, then test again and go from there.

Janet

[Rangeball]

Poolrx, "My Alk is down" is a good thing This is the lowest I've had it all season (very high alk fill water) PH hasn't bounced back up from this level regardless of intense aeration efforts (kids and rain).

Janet, the only place I've seen Mule Team around here is Walmart. They have the big box.

How many cups would you approximate 1/2 a grocer-store sized box is? Or if you can tell me how many ozs the GSB is I can extrapolate

[poolrx]

Rangeball, figured it was a good thing. Lowering alkalinity is probably the biggest pain in the butt next to dealing with algae
The Mule Team borax at Walmart should be a 4 lb box. 1/2 box would be a good start. Guessing that should bring you closer to the 7.3 range.

[Rangeball]

Thanks Joe