my chlorine pool ph keeps returning to 6.5! At the beginning of summer when the pool water was around 30ºC I noticed the ph had dropped rapidly to 6.5. I added borax to raise it. It raised to 7.6. After 15 days it returned to 6.5. I added a fountain to one of my return jets. With the pump on 10 hours a day the fountain does nothing to raise the ph. Anyone have any ideas why?
I added borax again and brought the ph up to 7.4 and again after 14 days it sunk back down to 6.5 again.
The TA is high. It changed every day, but is between 140 and 180.
I am using chlorine tablets that are sold as 'slow' chlorine with cyanuric acid added. Once a week after vacuuming and backwashing I shock the pool with rapid chlorine.
The pool water is constantly between 29ºC and 31ºC since the end of June.
Any help would be appreciated!
I added borax again and brought the ph up to 7.4 and again after 14 days it sunk back down to 6.5 again.
The TA is high. It changed every day, but is between 140 and 180.
I am using chlorine tablets that are sold as 'slow' chlorine with cyanuric acid added. Once a week after vacuuming and backwashing I shock the pool with rapid chlorine.
The pool water is constantly between 29ºC and 31ºC since the end of June.
Any help would be appreciated!