Here is my sump design---which I love the simplicity of.
but I only have three sheets of poret foam. 1 4" coarse, 1 2" med, 1 2" fine. This is for my 75 gal tank. the sump is a 30 gallon tank. return pump is a mag 5.
according to swiss tropical the foam only needs to be cleaned once a year or twice a year.
-can get much simpler, easier or cheaper!