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another thing that's just occurred to me is that trickles filter, especially those with rotating spray bars and DLS, get the media UNIFORMLY wetted due to the gravity forcing effect. Channeling is virtually non existent, this make for an extremely efficient use of the biological media. With a...

funny, I was about to mention rotting waste as well. And having it trapped in our filters is not a good thing. With a sump arrangement like Simon's he just takes the sponges out, gives them a scrub and rinse and puts them back in again. With a canister filter I have to disconnect, open the...

Clive, It was a long time since I read Thiel, but he stated that biological filtration takes a lot of oxygen, it's just that I don't have the laboratory equipment to find out how much. When you say the plants supporting the fish etc, it's not only the fish but also every other oxygen consumer...

Clive, from what I've been told it's 8 mg/l is the equilibrium level for water (of course this depends on temperature and altitude etc), but let's take that as our figure to work with. So no matter how much splashing around one does, this level cannot be increased since it's the equilibrium...