Thanks. I have a vinyl pool so calcium isn't a real problem for me. I have an AutoPilot Digital 220 swg. The AutoPilot rep had me on boost all day yesterday after he added the CYA. My pool is 21,000 gallons according to the rep. Also, AutoPilot recommends CYA of 60-80. Do you shock whenever there is CC present and do you base your amount of shock on the CC reading or only on the volumn of the pool?
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