recently our pool water has given us trouble - was not an issue for the last 5 years that we have had the pool.
Issue: Even at 100% output, the SWG is not keeping up with the chlorine consumption. (We replaced the cell last year.)
Water became cloudy, FC to 1.0, so I shocked with bleach. Got it up to 12PPM FC - 0 CC and held it for 5 days- water cleared up again.
FC dropped from 10.0 to 1 in a week. Water became cloudy again. Yesterday I shocked it again to 8-10PPM, and it is clearing up again.
Water temp - around 75-78 deg these days.
TA 70 PMM
CH - 210 ppm
PH I manage it to stay around 7.4 - adjusted with Muriatic Acid as needed
At the return nearest the pool, we see offgassing of CO2 proportionally to the level of the SWG we set. It bubbles away happily. So I would deduce the SWG works well but I can't measure it directly.
Built 5 years ago
25K GAL inground, Quartz surface
Jandy Aquapure - replaced cell last year
Brand new 425SF cartriges in filter .
Location - NJ
I see no evidence of algae - so what could be the source of chlorine consumption? We had lots of rain (>6 inches) in the last weeks But I don'1 think that's an issue.
The use is light - mostly my kids and I and we are trained in pool hygiene )
So any ideas what might be wrong?
We're tempted to drain and refill (which we haven;t ever done in five years) but I'd like to avoid the trouble.