I have been concidering using my Rena Filstar XP3 to do my water changes with. The Plan is to fit a T piece with a 2 way valve to the outlet of the filter pipe and one to the inlet pipe. I can then use the filter to pump old water out of the tank and fresh water in. The only thing that concerns me is if pumping fresh conditioned tap water through the filter would kill the bacteria in the filter.
I know that cleaning filter medium in tap water kills the bacteria, so I would assume pumping it through the filter would do the same.
Can anyone give me a definitive answer please?
Many thanks
Jim
I know that cleaning filter medium in tap water kills the bacteria, so I would assume pumping it through the filter would do the same.
Can anyone give me a definitive answer please?

Many thanks
Jim