We starting using the chlorine tablets basically just the first day we opened the pool and then I came on here and learned that's a terrible thing to do , so we shut off the chlorinator and have been using strictly liquid chlorine since then, meaning we have only been using liquid chlorine the past 3 weeks, no tablets.
Our CYA was at 40 at that time and had been pretty steady there. (At least I assume it has been steady. I only tested it a few times thereafter and then haven't tested it in a few weeks because there was no reason to (i.e., no water replacement, etc, except for lots of rain). We were going by the chlorine/CYA chart using our CYA of 40 to determine our FC target levels.
Just tested today on a whim (no real reason to) and CYA seems to be at 50.
FC: 5
pH: 7.5
TA: 100
CYA: 50
What would cause this increase? Is this just the residual effect of that one day (don't even think it was a total day) of using the tablets, taking weeks to affect our CYA level?
Our CYA was at 40 at that time and had been pretty steady there. (At least I assume it has been steady. I only tested it a few times thereafter and then haven't tested it in a few weeks because there was no reason to (i.e., no water replacement, etc, except for lots of rain). We were going by the chlorine/CYA chart using our CYA of 40 to determine our FC target levels.
Just tested today on a whim (no real reason to) and CYA seems to be at 50.
FC: 5
pH: 7.5
TA: 100
CYA: 50
What would cause this increase? Is this just the residual effect of that one day (don't even think it was a total day) of using the tablets, taking weeks to affect our CYA level?