Response to This would be the correct pressure gauge for the Hayward Sand Master Filter System. The sand you would need is #20 Silica sand also called Pool Filter Sand, the amount of sand you would require would be dependent on if you have the SM1700T or SM1900T the label on your filter tank should have one of the model #'s notched out. If you have the SM1700T you require 100 lbs. of sand and the SM1900T requires 150 lbs. of sand. We also carry all of the parts for the Hayward Sand Master filter system

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