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use lava rock or alfagrog, just as good as SIPORAX and efisubstrat and nowhere near as expensive: http://www.ketteringkoi.com/acatalog/Filter_Media.html I quite like the ADA bio rio myself but could not get hold of it, it's basically lava rock, but in smaller pieces, so even Amano had the...

the question here is maintenance, the 2078 is easier to maintain, but it only has 8 litre filter capacity (with 0.6 litres for the prefilter) I won't be running my 2260 like most people, I will feed it via its own prefilter arrangement which means that the whole canister is NEVER touched at...

this is just a guess since I'm an amateur, and you'll have to excuse me since I'm not a chemist so I'll have to make educated guesses and assumptions, which I'll gladly have corrected: well a large water change will take out spores and drop the ammonia levels as stated, but is would also reset...

my problem with wanting well mixed flows is that most canister filters don't accommodate it according to their usage literature. And Eheim 2217 is said to be used for tanks up to 600 litres!! With our ways of thinking this is way too optimistic. I've looked at Amano's filters, he uses a very...

in practical terms we don't even need to go there, viewing it as a uniform flow is much more appropriate. I don't think we should even be thinking of the flow as waves, more like uniform particles coming out. You are talking about super positioning and cancellation effects of waves, not required...

Resonance is to do with harmonics, and therefore not pertinent to the discussion. The incident in question occurred in 1850 when French soldiers crossed a bridge and their uniformed periodic stamping created the resonance that destroyed the bridge, it required a certain frequency and as...

as a dedicated Eheim user I would never touch an fx5, heard too many horror stories about them. I only trust what works. I don't like the newer Eheims with their pointless electronics etc. . A canister filter should be designed like the following: 1) inlet at the bottom 2) outlet at the top...