Why does your pool's PH keep increasing?

Gunite and plaster have a high demand for acid because of the lime in the cement. And or high calcium make up water.


Your pool will naturally increase in pH due to swimmer's waste, sweat, urine, etc...

Keep your pH at 7.6-7.8, not 7.2. 7.2 pH is base upon the Langelier Index which was used for local water companies, but there's a world of difference between pools and how the water company treats your tap water. Good index but bad application for pools.