trader_4 wrote, on Wed, 25 Jun 2014 02:51:25 -0700:

How many gallons?
40K

Four floaters? Hundreds of pounds a season?
Your season is longer,
but something isn't right here.

The sun is brutal here, so I both add isocyanuric acid
(CYA) powder (not granules) and use the floaters until
the CYA level gets around 60 to about 80 ppm, then I have
to pull the floaters, and use liquid chlorine from that
point onward, until I empty the pool again.