| Dick-
I'm finishing the pond in the greenhouse and I believe I've settled on these filtration paths- bottom drains to vortexes, empty of course, to aerated mat chambers, to 5 foot tall towers of lava rock. So, yes this media is entirely heavily aerated. Also, media will be housed in covered, opaque containers, except the top tray, though I don't believe dark is all that neccessary.
It happens to be about 16 Cu. Ft. per 3600g at 3000gph.
Mickey the windowman |