11-30-2011, 06:35 PM
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This will shock some, no doubt...
I have always rinsed my filters under the tap.
However, there is a qualification to this: live plants. If the tank is well planted, biological filtration is not necessary because the plants do it. My canister and sponge filters are just there to keep the water clear, and they do that simply by moving the water through media. The job of keeping the water clean is left to the plants.
There is also more nitrifying bacteria in the substrate and on every surface in the tank, than in the average filter. So unless the tank is overstocked or biologically unbalanced, no detriment is likely to occur from using tap water to rinse the filter media. But, this applies to well established tanks. I would not recommend this in new tanks without plants.