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Rinsing filters question

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OK so you pretty much read everywhere to rinse the things off in "used" tank water.

At first I just said ok...cause what do I know.

But now I'm wondering why exactly...I mean all the Beneficial Bacteria is "sticky" and water changes to not really impact it because the BBs are not in the water column. It all really gathers in the nooks and crannies like sponge filters because that's where the rest of the crap also collects.

And again I understand we want to wash off said crap without ruining the BB growing there...but if we are doing water changes among other to things help "freshen" the environment why would we not also wash the filters in that same treated water?

More I think about it the analogy I have is peeing on a dirty toilet bowl.

Ok maybe not the best analogy...but really...why use dirty water instead of clean treated to rinse sponge filters?
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The reason you don't want to wash biological media in tap water is because the chlorine in the tap water will kill the beneficial bacteria. You could use R/O water or new/clean treated (w/ dechlorinator) water.

The tank water is just more convenient and a known safe means of washing the media without killing the beneficial bacteria, and it gets clean enough, plus it sort of still leaves some "food" near the beneficial bacteria's "home".
I believe the beneficial bacteria can also be killed off with drastic temperature changes (of the water) as well.

However using a bucket of clean/new treated water, you do run the risk on having the chlorinated water in the bucket not fully removing the chlorine yet when you go to rinse the media, so it's still risky that you might kill some of the BB. It can be done though, I just personally don't want to chance it.
I guess the same can be said about the new water from a water change into the tank not yet fully "de-chlorinating" before turning the filters on. I usually let the new water sit/mix a while before turning the filters back on and/or add a little extra dechlorinator/water conditioner.

You can wash mechanical and chemical media with tap water since they usually (can be instances where they do house a significant part of the beneficial bacteria colony) don't have any significant source of nitrifying bacteria. The nitrifying bacteria in the tank water and all through out the tank is minimal as well which is why it's not worried about much.
 

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Just to mention, I have heard of too high of ammonia levels also killing nitrifying bacteria (I.E. dosing way too much ammonia when cycling tank).

As mentioned though, the rinsing water doesn't have to have ammonia/nitrites, you just don't want to use water with chlorine in it, hence Reverse Osmosis water and treated water are fine to use (both of which have no ammonia/nitrites -usually-).
 
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