We're on our third season now, both with an AG pool and with TFP - love them both!. Last year, we left the pool up for the winter, so this is my first time opening. I followed the TFP closing method, brought the FC up to 24 (CYA was 80 at closing - we have a SWG), and kept it there for 24 hours before partial drain and cover.
On opening yesterday, FC was 9.5, CC was 0, water was clear and beautiful with a slight fresh chlorine aroma and no CC stink. My first question is, do I need to boost the chlorine to SLAM level or not?? By standard TPF guidelines, I'm inclined to just refill, do my normal full testing, and adjust to normal targets. If my FC was below 4, I would certainly do a SLAM and OCLT, but at 9.5... this water is swimmable right now, right? During refilling, I can easily keep FC at and above 3-4.
My other question is about water loss. When we drained last season, we brought the water line just below the jets. We could see the cover lowering during the winter, but I never found any leak when I checked. On removing the cover, we could see the water had fallen 12-14". The cover was just a "cheap" tarp pool cover with a barely functional coated wire strap. It flapped considerably and we eventually had to tie down with tent stakes. Is it possible to lose that much water through evaporation? Or should I stock up on vinyl patch supplies? We had a pretty mild and dry winter (western Mass.).
Thanks for any insight and advice.