Hello all. What a great resource!!!

I am building my own pond filter (150 gallon) and am not sure about water flow through the chambers.

The filter will be a three chamber style - one to settle out the big stuff and two for
bio-filtration. When the water goes from the settlement chamber to the bio-chambers, does it matter
if the water flows up through the medium, or trickles down from the top?

What are the pros and cons of either method?

Thanks!

- David