I was intrigued by the brief discussion about Matala. I went to their web
site and must admit to being a tad confused.

Is this a product I can use in my skimmer, starting with a sheet of more
porous black Matala followed by green or blue? The water would go through
the black and then the blue.

In my waterfall filter box, since it is fed from the bottom I would put the
sheets of Matala vertically, alternating black, green & blue.

Is water flow really not impeded that much by a full filter?

San Diego Joe
4,000 - 5,000 Gallons.
Koi, Goldfish, and RES named Colombo.