Got the kit yesterday and ran the gamut of tests it offers. The only thing I was really surprised by is how low my CYA is. Maybe I'm not doing it right but it tested out to below 20. I did it three times to be sure, over yesterday and today. I find that strange because I'm using pucks for chlorination (until I run out and switch completely TFP) and have been for the last 15 years. I have never emptied the pool. I do fill with soft water when it needs a little top up due to evaporation; it's very hot here and that might be every other day or so. We don't have much splash out. I don't backwash my filter (this one is not designed for that).
Since CYA does not evaporate, how is my CYA so low? It's not making sense to me so any ideas out there?
Since CYA does not evaporate, how is my CYA so low? It's not making sense to me so any ideas out there?