Don’t often post and now here have come two in quick succession.
An acquaintance rang today to say he has a problem with a pool’s alkalinity. Not sure about the rest of France but we are having a real problem this year maintaining the base alkalinity at a regular level on some pools. His is worse than any of mine.
He is repeatedly losing alkalinity and the pool goes green pretty much every 10 days. In the last ten days it has gone from 120mg/l to 7mg/l. He cannot see any reason for it. The pH has stayed pretty steady, fluctuating around the 7.3-7.4 mark. Normally he is disinfecting with hydrogen peroxide plus a uv unit and the pool has always been fine. He has switched over to chlorine to see if that would help solve it but the same is happening.
Any pointers as to what might be killing the alkalinity so quickly? None of the pools I look after use H202 as a disinfectant so not really sure of the potential chemical problems. I said I’d have a quick ask.