What's your incoming water pH?


Silver Supporter
Jul 29, 2018
Katy, Texas
My pool water pH is constantly on the rise, it seems. I never have a problem of too low pH. That made me wonder what my incoming water is. Here is mine. Does this seem typical?
* Rain water (TS Imelda came through last night, so I had a good source) pH=6.9
* Fill water (softened with potassium water softener) pH=8.1
With our summer near-drought conditions and upper 90's daily high temps, I've mostly had fill water added with very little rain. Using about a gallon of 31.45% muriatic acid every five weeks or so.


Gold Supporter
TFP Guide
Jul 21, 2013
Northern NJ
Most tap water has pH between 6.5 and 8.5, but some municipal water suppliers may raise the pH of water as high as 9 to prevent plumbing corrosion.


Active member
Jul 9, 2019
Southeast Texas
Imelda's remnants are pounding us right now! My fill water was at least ph 8 (that's the highest my test would go,) but my tap water CH is very low. I add a cup of acid every day. If I get a break in this dang rain I could use a quart of chlorine because I ran out yesterday and didn't get to raise my FC up before the deluge.