wrote in message news:uXZbc.4161$G3.41340@localhost...
I disagree - I use a block of filter foam over the intakes of my Ehiems.
Medium planted tank (90 gallon) medium population. Every water change
(weekly) clean the prefilters. easy. just cut a block of foam to the size
you need (I'd think 2"x2"x2" for a 404) cut an "X" into the end and slip
it over the intake.

We'll have to agree to disagree :-) I rinse the filter media weekly, so no
need to clean a prefilter :-) That keeps the nitrate levels down to where
I like them. I guess that your maintenance achieves the same end result.

Graham.