I've moved to FL and now have my second pool (first one I maintained for 4 years, inground). Prev. owners said they'd had a recent problem with low chlorine and replaced the flow sensor on the SWG. When we moved in, the SWG was on 30% and pump was running for 8 hours.

My first tests with my oft-refilled PS-234S yielded:

pH 7.2, maybe less
FC 23.0
CC 0
TA 90 (test turned blue initially, then yellow at 90)
CH 320
CYA 90-100
Salt 3000

I turned off the SWG!!! Slowly, but surely the chlorine has been dropping. Now, 9 days after my initial tests and no swimming, I tested:

pH 7.7
FC 10.0
CC .5 (maybe less)

I'm thinking I could do a partial drain to drop the CYA into the proper range for the SWG but is it really necessary right now? With the higher CYA, is 10 FC swimmable? I'd like to drop the FC just a bit more (maybe wait another day) and then turn on the SWG at a low level and monitor the FC level and add some muriatic acid.

Any other recommendations, thoughts?? My signature reflects this "new" pool.