Test results on new pool in Tucson

[FormerBromineUser]

Woot! Great news! Kudos on your persistency; hope you get some warm temps to enjoy the rewards!

[PoolDoc]

Glad you've had some success.

One caution for future reference: we've advised store-brand bleach for years, to help pool owners escape the confusion of the multiple 'flavors' of Clorox bleach. But now it turns out Walmart is adding 'flavors'!

So, here's the key: ONLY purchase bleach that shows "8.25% sodium hypochlorite".

No %? No purchase! "Bleach" without a % can be 1% or less!

[Wilco]

So noted. Actually I was getting 3 packs of Clorox at Costco for $8 each, better than walmart generic, and maybe a little more reliable strength-wise.
Now that cl levels are stable (5-7) I am noticing pH is wanting to creep up. I've added acid twice in a week. Before, it seemed like my pool water would naturally drift lower in ph, and in was adding the borax. Could be cooler temps at night. tA is 110, not much change. Will monitor for a while, but I was under the impression acid use would be rarer.

[Wilco]

Perusing other threads I noticed it mentioned that aeration can raise pH. I have had the water feature on 8 hrs/day when pump is on ( two lion head spouts). Could that do it? The timing fits.

[CarlD]

Yes. Absolutely. Water features like fountains and waterfalls cause aeration, which raises pH.
We use it as a tool for lowering total alkalinity as it is the only way to raise pH without TA going up.
Splashing kids, pointing returns at the surface so they bubble or spray also increase aeration.

[FormerBromineUser]

Lion head spouts??? Do you dress them like the Art Istitute does in Chicago? Tomorrow is opening game for the Hawks... By the way, love the word peruse.

[PoolDoc]

If you have a concrete pool, lowering the carbonate alkalinity may not be something you want to do. Aeration raises pH by lowering acid carbonates (carbonic acid and dissolved carbon dioxide). This in turn results in reduced alkalinity (bicarbonates and carbonates).

Also, the note about the bleach products was just a caution -- I really had no idea whether it had been an issue for you.