I have been reading a LOT on TFP the last few weeks and would like some more info on some things I don't understand.
I am running a SWG in a vinyl inground.
I am at 6.5 FC, 0 CC, 70 TA, 7.5 PH, 45 CYA, 50 CH.
My water is clear.
1) I don't understand why they want me to run such a high CYA just because I am running a SWG. (70-80 ppm with a shock level of 28-31)
2) I don't understand where the recommended shock levels come from. I have always done breakpoint superchlorination. Whenever my CC gets over a .5 I shock to ten times whatever it is including my FC level. So now what are the signs that I need to do a SLAM? Is it saying that a SLAM with the recommended CYA levels is 28-31 ppm in a SWG pool?
It's obvious the method works, I am just having some trouble getting my head around some of it.
Two days ago I got 2 inches of rain in one hour. Yesterday I had seven 12 year old girls in the pool for 6 hours covered in sun tan oil and playing like crazy. In the old days I would have shocked the pool just in case. I didn't and today all appears well.
Any help bringing me up to speed will be greatly appreciated.