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    How much sand should be in sand filter?

    I have an older sand filter (15 years?) where the manufacturers label came off so I can't find the model number. I think it was manufactured by Sparco based on the the small bit of label that was left. The filter is 24" high 19" in diameter. I have a 12,700 gallon AGP with a 1.5hp Pentair Dynamo...