I'm not familiar with this particular filter. You should read the manual for directions on assembling and start up. If you don't have a manual, try this link:http://www.pentairpool.com/owners_ma...s/fns_plus.pdf
I usually put the required amount of DE in a 5 gallon bucket 3/4 full of pool water, mix it up with hands, then add to the skimmer by pouring slowly & steadily while the pump is running.
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