I operate all my Penquins without the biowheels, just use them as mechanical filters. Biowheel slows down the flow and makes splashing noice, so it's more a hassle than help. I have used over a dozen Penquins for over 20 years, and not a single one dies or leaks water. There are many things that can go wrong with wet and dry or canister fitler deisngs because they are more complicated. The Penquin design is so simple that there is hardly anyting to go wrong except the biowheel which I don't use. The only negative I have running 4 Penquins in a 125 gal with messy CAs is that I need to change filter pads in all 4 as frequently as twice a week.
I wouldn't agree that AC110 is the best. It may be the best in term of flow rate, but there are couple design flaws that make AC vulnerable to leak. First, the unique up lifting flow can pop up a clogged up sponge to leak on the top. Second, after repeated detachment of the motor to clean the impeller will lead to failed O ring and leak.
Yes, it could pop up a clogged sponge, but with general maintenance, the sponge won't get clogged. When I say general maintenance, I mean squeezing the sponge out once every 2-3 months, which is much better than changing filter pads up to twice a week like you said. Same goes for the o-ring. I have only had to clean an impeller once, and thats when I accidentally got some sand in my ac110 - otherwise, I have never needed to (although I do check every so often, and have never had a failed o ring on an acxxx..?) What I gather from the above post is that penguins have inferior filtration and require more maintenance?
