I have a Pentair IC20 Salt Generator. It is designed for up to a 20k gallon pool. My Pool is 12,500 gallons. I have been adjusting the Salt Cell percentage of operation to 33% from 50%. However, I seem to be using about 1 bag of salt per week. How much salt should I expect to use in a pool my size. I also have been noticing I can hardly keep my PH down to the acceptable area. I add Muratic Acid and it brings it down for 1 day and it shoots right back up. I am in Houston and we are experiencing 1 inch of evaporation of water per day, but I was told the salt does not evaporate. This is a new pool and I have never had a salt generator before. Can anyone offer some advice?