I have an older plaster pool (in need of replastering) that I seem to be pouring acid into to get the pH down to 7.5 and keep it there. The alkalinity runs about 90, the pool is clear and I keep the chlorine balanced with 10% bleach. I know that water features can cause CO2 to be blown off, reducing the carbonic acid in the pool and raising the pH, but my pool only has one water feature. That is where the spa water gently flows over the lip of the spa and into the pool. No bubbling, no spray.
There are some spots in the pool where the plaster has been etched to the concrete but I wouldn't expect the concrete to be contributing to raising the pH any more than the plaster.
What could possible be the issue with getting the pH down? I have gone through almost a gallon of HCl in the last two weeks!
There are some spots in the pool where the plaster has been etched to the concrete but I wouldn't expect the concrete to be contributing to raising the pH any more than the plaster.
What could possible be the issue with getting the pH down? I have gone through almost a gallon of HCl in the last two weeks!