i have noticed that on two pools (SG and JK on signature) the pH levels are hard to maintain at 7.5. They usually go up to 8.2 on every "service" we make on them.
We get there, we check pH, we adjust with muriatic acid to 7.5 and then come back in three days again just to find that the pH is again at 8.2.
The pumps on both are running for 8 hours everyday and the water from the spa cascades down to the pool. I believe this kind of "aeration" raises the pH ??
Do you think this could cause the pH to raise? Do you recommend anything to prevent this from happening? Sometimes the pools are not being used but the maintenance is required.
Both pools have automatic fill systems but they don't loose water so that new water comes in that often (raising the pH as the city water here is high on pH).