[Bill 4680]

I have to add muriatic acid every day to try to get my ph below 8.0-8.2. Is this normal? This is a newly surfaced "Pebble Fina" pool.

[yellowsnow]

Take a water sample to Leslie's or NPS. They check it for free hoping you will buy chemicals. Perhaps you are low on stabilizer/conditioner stuff.

NPS has a big sale on chemicals through the end of June.

[MediocreButArrogant]

Is your water being aerated, through a water feature, or constantly running spa jets? That will raise your pH, and in fact, is a common way to raise the pH if it's too low. For instance, I need to lower my TA, but keep my pH about where it is, so I use acid which lowers TA and pH, then use aeration (spa jets) to raise the pH back to where it should be.

Also, from Pebble-Tec web site: "Keep in mind, based on your water source, you may need to add "muriatic acid" to your new pool 2 to 3 times per week during the first month. After 30 days, the pool should be checked 1 to 2 times per week and adjusted accordingly."

[Austinpoolguy]

The process of creating chlorine from salt also produces caustic soda as a by product. Which has a high ph.

[Bill 4680]

Originally Posted by MediocreButArrogant

Is your water being aerated, through a water feature, or constantly running spa jets? That will raise your pH, and in fact, is a common way to raise the pH if it's too low. For instance, I need to lower my TA, but keep my pH about where it is, so I use acid which lowers TA and pH, then use aeration (spa jets) to raise the pH back to where it should be.

Also, from Pebble-Tec web site: "Keep in mind, based on your water source, you may need to add "muriatic acid" to your new pool 2 to 3 times per week during the first month. After 30 days, the pool should be checked 1 to 2 times per week and adjusted accordingly."

Thanks for your help. I've been running a waterfall & didn"t realize this raised the ph.

[MediocreButArrogant]

Originally Posted by Bill 4680

Thanks for your help. I've been running a waterfall & didn"t realize this raised the ph.

The feature has to aerate the water, like a fountain spraying water. I'm not sure a waterfall would do it. If it was a slow moving one it probably wouldn't, but if it was a lot of water at high speed you could be getting a lot of aeration. You could try reducing its runtime and seeing if the pH rise is lessened. Aeration strips CO2 from the water, reducing the amount of carbonic acid in the water, and therefore raising the pH.

Right now, I think it's the new pool surface that's more responsible for the high pH.