I think that, after my filters have been in about 3-4 weeks, they get gunked up enough so that the water flows back into the tank through the overflow outlets unfiltered. I say this because my wheels on the BioWheels slow down until they turn intermittently due to the increased water flow inhibition caused by filters getting clogged. This may be to some a very elementary finding but it is a new discovery to me. I've only had BioWheel filters for 3 - 4 weeks now am I'm noticing this. It probably happens to other filters too but is not as noticeable with them. I have noticed that when I put a cheapo filter in my Tetra Whisper 30, water flow is only maximum for a week or two before I see water coming through the overflow outlet which is located at the same point that the intake tube comes in just above the motor.
Can someone confirm this for me?
I do not plan on changing the filter immediately b/c I don't like losing the bacteria, but I do plan on rinsing them in aquarium water obtained via a PWC
. I rotate changing out my multiple HOB
filters so that biological activity does not cease when a filter is changed. Is this a good plan? How long should a replaceable filter last?