You will need to know the internal area of your filter (square footage, usually listed on the manufacturer's label on the filter) prior to adding D.E. powder.
The proper dosing amount is always listed on the powder's label; however, as an example, a 60 sq.ft. filter should take approximately 7 lbs. of D.E. after backwashing.
Keep in mind that backwashing does not physically remove all of the powder and debris from the filter each time, so it's usually a good idea to only use about 80% of the recommended amount unless a full filter tear-down and cleaning has been performed.
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