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Eheim have a reputation of being very good filters but what really makes a canister filter a good filter?I have changed a lot of canisters so far and in my opinion a good filter is a filter which seals water well.Is there really anything else?electronic filters of course is something different.
I was in a house recently and saw a 60 liter easy crystal Tetratec tank with that small filter in it and at least a handful of flakes inside all over the tank just with 10 small fishes.She said she had been feeding like this for ages.There was no ammonia in the water.If that small filter was able to cope with that HUGE bioload what is all that fuss going on about using special ceramics to increase surface area,wet/dry filters etc. ??
 

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Also I bet biological filter media(except bioballs)get clogged a lot faster than most people think.Do you lubricate the o-ring every once in a while?
 
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