I've been using a Magnum 350 filter on my 29 gal
. freshwater aquarium for about 8 yrs. now, without any problems.
Recently, I've noticed a big drop off in its power, even after installing clean filter media. It is barely pumping enough water to keep the bio-wheels running.
I've noticed that the magnet surface on the impeller is no longer smooth (there are scored lines in it) and I am wondering if that is the problem.
If that is the problem, is it worth replacing the impeller set-up or is it time to replace the whole filter?
Thanks in advance for any input.