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I have 25 year old in ground pool (~30k gallons). Current filter is sta-rite (30 inch model with 400lbs of sand) has been in place for these 25 years. I bought the house 4 years ago and the last owner told me he replaced the sand in 2007 (he could not generate a receipt or any paper work thou)...

Just moved into a house which has an inbuilt in ground pool. I have never owned a pool before and trying to learn the chemistry portion of maintaining the pool. I ran a test yesterday (using Pool Master kit) and here are chemical numbers - Total Chlorine: 5 - pH: 8.5 - Total Alkalinity - 50 I...