have you considered adding more dirt?
I haven’t tried adding DE to sock filters, and it may not work in a sock unless you’re also spinning it in a fuge.
do you have a buchner around?
http://future4200.com/search?q=buchner
access to magic dirt?
http://future4200.com/search?q=depth+filter
http://future4200.com/search?q=filter+aid
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