bought this for my 56 gallon bowfront, works pretty good, cleared the water up real nice and definately sucks a lot of water, can actually see it pulling the water in. Was worried about it priming based on other reviews but i have seen no such problem thus far. Only 4 stars because it is a little loud, we sit 20 feet away from it when we watch tv and i can hear it, not enough to ruin things but when you walk over to it the sound is definately there. Would recommend as long as it isnt going in your bedroom.

I have had my Penguin 350 Bio-wheel just over a year now. I purchased a different brand of power filter to replace it this morning.

After about three months the filter motor began making a constant and irritating grinding sound. I had performed monthly cleaning of all the filter parts before this, and when the grinding began I cleaned it thoroughly again. It made no difference and the grinding continued.

Strangely enough a month or two later the grinding stopped for a few weeks. I rediscovered the beauty of a quiet living room. Not for long, because inexplicably a few weeks later the noise began again. So instead of paying Penguin $14 through their website to purchase a new impeller assembly (which probably wouldn't fix the grinding anyway since my impeller shows no sign of damage) I decided to purchase a new Aquaclear filter instead. That is what the owner of my local fish store recommended in the first place, but I bought the Penguin in order to save a few bucks. Whoops. I hope someone out there learns from my mistake.

Does a great job of filtering but it is noisy. Wish I would have bought the Emperor 400 instead.

this is an Amazing filter. the bio wheel does a great job at polishing the water... i can even say, this filter works better than the Magnum 350, mostly because it needs less cleaning

Had this a year and it was not good....it would lose prime and was a pain to get working again after cleaning. It was also VERY noisy! Bought a self prime canister filter instead.