Air lift capabilities

[MaloK]

I might been a little thick I got 1.57" 39mm (20PPI) But with the fine sponges behind and the biomedia in line with the water flow...

Since it should be somewhat a pretty low bioload it might be pretty good.

But lately I'm finding out that I pretty much underestimated the pooping capability of a shrimp colony.

 

[Willow 123]

I'm no expert but 20ppi is quite coarse,(mine is 30ppi), but that foam might work well as a prefilter to your sponge filter. I, for one, would be very interested in how you get on. It throws up up interesting possibilities.
One thing I found is that it took about a week for the Matten filter to become 'active' to the extent that my ammona and nitrate were at zero, which, in my experience, seems to be quicker than other methods of filtration, eg a sponge filter in a second smaller tank, set up at the same time, took about two weeks to get to the same stage.

 

[MaloK]

There is something that low flow filters have. that pressurized canister will never get.

I got some intake sponges that are rated 20 ppi and they surprised me on the density they become when filling.

So I thought 20 ppi would be an adequate pre-filter to a finer sponge and help.

But if I see that they are not required I can still remove them.