I think I know the answer to this but just need confirmation. Been posting and learning for about a month now and have found TFP methods intuitive and better than pool store advice.
New house, new pool 1 mo ago. SWG cell old, not working. Pool not balanced, followed tfp recommendations. Got pool slammed, balanced for non-SWG. Got to know pool chemistry, maintained pool with bleach for a few weeks. Friday of last week, upped CYA from 30 in preparation for SWG cell replacement, aiming for 60. Got it to 53, but immediately after, could not maintain FC. Dumped a ton of bleach, got it back up to appropriate FC level of 6. FC dropped again overnight (day 2 of upping CYA), put in 2 more 121oz bleach bottles. That same day, I started adding salt to get it from 900 to 3000ppm. Then replaced T-15 cell. Got the cell working, let it run at 70% for a few hours to see how it did.
Q1-- did the addition of CYA cause the FC to drop because it was binding with available FC? Or did something happen in my pool that I need to figure out?
Q2--now my FC is at 16, my CYA is at 50, and FC seems to be maintaining (FC was 15 at 8:30am, 16 at 8:30pm, no bleach added, SWG ran for 70% for 4 hours)... all other values are good-- TA 80, pH 7.5. If I turn off the SWG for a day or two, I'm not sure with this higher CYA how long the FC will take to disappear. So, is it okay to let the pool just sit there with the SWG and pump/filter off? Or, should I re-set the schedule for the SWG to not be on, let the filter/pump run without it, and just keep rechecking FC?
Q3--Lastly, is it safe to swim with these high FC levels? I know that the CYA is a buffer, but it seems a bit too high...