18 x 36 Oval with vinly liner. Hayward s-200 filter and Hayward 1.5 hp super pump.
FC = 1
TC = .5
PH = 7.5
ALK = 80
CH = 60 ( Not really worried since it's a vinyl liner)
CYA = 120 (I think this is my problem).
I opened the pool a few weeks ago and PH was good and ALK was a little low. I usually have it tested at pool store first time just for piece of mind. I have a Taylor K-6000 test kit I use the rest of the time. The funny thing is my initial test kit showed CYA of 120 and pool store said 40. I said test it again please and they got 60. I said try it one more time and they got 115 which is basically what I tested. My faith in their tests is a bit diminished.
I'm assuming I'm gonna have to do the drain, refill, drain, refill method to get the CYA down to reasonable level. One chart I saw online said with my CYA level my FC needed to be around 6-8 for a "normal level". The pool calculator said I needed 3 of the 128oz containers of bleach to get my FC up to that level. I'm done with the 3" tabs and am going to bleach only in the future. Does that much bleach seem reasonable to put in at one time?
Thanks in advance for any advice.