i have a vinyl ig free form pool of 66000 gal...yes its true..i did not have this pool installed, it was here when i bought the house....my life was hell until i bought a robot to vacuum the pool.. i am wondering how many gallons of bleach a month would i need?? right now i have a automatic clorinator and use tabs....thanks guys....oh excuse me for being rude....this is my first post and my name is ray from farmingville new york...