I just recently purchased a 55 gal
aquarium set-up that came with a Magnum 350 filter. Its been running for 2 weeks, and everyone is happy. Fortunately, it had been running right up until I purchased it, so I really didn't have to start a new "tank cycle." Anyway, I have discovered that this filter is one that can be changed from polishing to standard filtration and vice versa. What I cannot seem to find ANYWHERE is how to actually turn on (or off) the polishing mode. There are on/off switches at the bottom of the canister filter, but don't seem to indicate which switch is for what. Its not even in the owner's manual....just says that it has a water polishing mode. I watched the YouTube video as well on this filter, but they also don't tell you how to turn one option on/off vs. the other. I'm sure someone here knows lol.