new gravel bog - question

somebody mentioned up flow... this is also the principle of reverse UGF and because
it is moving from bottom to top the gravel doesnt get compacted. to rinse the inflow
is stopped and the bottom drain is pulled to let the gunk out the bottom.
I clean my veggie filter once a year in fall. pull out all the plants (most of em
going inside) and then use a shop vac to suck out the mulm etc.
Ingrid


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