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I am used to treating algae in PA with a vinyl liner. I now have a house in FL with a cement pool. It has gotten black spots that appear to have actually eaten into the cement. How do I correct this issue?

My local pool store recommends the CH level to be on the higher side in order to protect me heater. Any truth to this?

Will the CYA or Calcium Hardness level ever go down naturally? Is replacing the water the only way to achieve that goal?

Re: Chlorine Lock Causes? I am also having an issue with chlorine. Last year we could not keep the chlorine level high enough to show up on a test. The CYA levels were fine. This year we drained some of the water but still cannot get a chlorine reading to last more than a couple hours. What do...

I have an 8 yr old, 25,000 gallon, chlorine pool. This summer for the first time we could not get the free chlorine level to register after adding large amounts of shock and turning the chlorinater on high. All other test readings stayed within the normal ranges and the water was clear. After...