Salt - Can't be much
Temp 60 F
Question the first: At the above levels, I get a CSI of -.01. When I add acid and drop the pH back down to 7.4, CSI drops to -.39. Would it be better to maintain pH between 7.6 and 8.0 rather than 7.4 to 7.8 at this point in the season? Once it's time to swim and the water is around 80 F, this is a moot question, as 7.4-7.8 pH has CSI nicely centered around 0.
Question the second: Is there a guidline for determining the optimum CYA level for a pool? My pool gets a lot of shade, with very tall trees south of it. Almost no sun this time of year, and only a few hours of full sun even during the peak of summer. So why not run a lower CYA level? Can I just run a daytime FC loss test and use that to figure an optimal CYA level for my pool? This is my third year owning the pool and my first full season pool-store free; dropped that habit mid-summer last year. So I'm still figuring out how to best tailor standard advice to my pool.