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Honest question, I am not making light of anything more than trying to find the places and circumstances where they are not only viable but recommended. My experience with them is a simple nightmare and that is over 20 years of using them off and on with both airflow, powerheads and a combination of both.
I also have a question about reverse flow:
Where does the actually filtration happen in reverse with an UGF? Do the powerheads need filters? Does the gravel and plates act the same as they would using them in the "standard" fashion? Do you have to have another filter to act as a mechanical filter with reverse flow.
I also have a question about reverse flow:
Where does the actually filtration happen in reverse with an UGF? Do the powerheads need filters? Does the gravel and plates act the same as they would using them in the "standard" fashion? Do you have to have another filter to act as a mechanical filter with reverse flow.