In article ,
says...
I have my own home grown attitude about filtration. I believe the
filtration is really a strainner, that is it holds larger solids, but
the constant flow of water erodes the larger solids down to smaller
sizes that then continue through the filter media. If so, why filter?
I think the smaller particles are more efficiently reduced by the
bacteria in the tank.

Then what the heck is that junk I squeeze out of filter every month or
so? Even if it's all bacteria, which is doubtful, the filter makes a
great place for them to grow :-).

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BNSF = Build Now, Seep Forever