Originally Posted by
Ben87
hi, I'm revamping my pond filtration and planning to run skimmer -> pump -> 2 S&G filters -> moving bed -> waterfall
Currently, I have a single S&G filter in a 90 gallon trashcan. It's worked great for keeping the water clear, but when cleaning, it doesn't seem to blow evenly, takes a lot of water to flush (harder to keep pond level in acceptable range), and won't handle the full flow of the pump (it's rated for 4200gph but I'm guessing actually flows 3-3.5k). So I think if I replace it with 2 S&G filters in parallel following birdman's design, that will work better.
My question is whether is whether to repurpose the 90 gallon trashcan for a large moving bed that both S&G filters flow into or to buy 2 more 55 gallon barrels and have each S&G flow into a separate moving bed. I think the 90 gallon would fit plenty of media for the bioload, so that's not the concern. It's primarily whether I'm going to get media sucked to the outlets and cause it to overflow at a 3.5k flow rate. Of course a single moving bed is simpler to plumb, less space, and I already have the 90 gallon available, though.
Anyone with experience or recommendations on this? 90 gallon trash cans have that weird shape that's kinda square at the top and round at the bottom, so not sure how that geometry might affect things. Also I have a single Hakko 40L air pump, so on either scheme, if I can get by without having to buy another one, that would be a plus.
Thank you!
Ben