Basic question about PH balance levels

[duraleigh]

Hi, Melissa,

The pH of pool water generally is ideal between 7.2 - 7.8

Most folks on this forum use muriatic acid to adjust it lower and 20 Mule Team Borax to raise it.

Many other factors have an influence on it as well....up or down.

One of the most common things that lower it in residential pools is the 3" tabs or pucks that are used for chlorination. However, using plain bleach as a source of Cl will slowly raise pH.

Acidic rainfall can frequently lower it as well.

So, yes depending on the type of Cl used, ph can drift up or down. Pool usage is probably a pretty marginal factor.

[waterbear]

Also the pH test itself can suffer interferance from high chlorine levels. Some pH tests in better kits are more immune to this than some of the cheaper ones. If you just shocked your pool the pH will probably read very high but this is a false reading. Only check and ajust the pH when your chlorine levels are below 10 ppm to be sure.

[ShelleyAnn]

I rely on the BBB method solely. My CYA is around 30, and I have to add a little Borax at least once a week to keep my PH up. This is without a single drop of rain since we've had the pool up...Oh, we did have some snow in late April. I have always wondered why because it seems to be the opposite of everyone else, but it's true.

Shelley

[Watermom]

Hi, Melissa,

However, using plain bleach as a source of Cl will slowly raise pH.

Using bleach does not always raise your ph. I use bleach only, but never have had it raise my ph. I do occasionally, however, have to add some Borax to raise it - usually after a lot of rain.