06-06-2012, 10:08 AM
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IMO "bypass" is a gimmick put out by eheim and perpetuated by their fan base. Yes, eheims have zero bypass, and yes there is *some* bypass with other canisters, but no one ever talks about HOW MUCH.....because they don't know. So they could be touting this wonderful zero bypass when other canisters are 98% bypass free. To me, that is inconsequential. For starters, the Rena/fluval/sunsun baskets fit pretty tightly together - tight enough that you often have to pull them apart to separate them. Not a perfect seal, but pretty darn good. Second, the water is being sucked up through the center of the filter - in order for the water to leave the filter, it must go through the media baskets - there is no water leaving the filter that hasn't been through media, though a small amount may not necessarily have been through every stage of filtration. Also, if the concern is water leaking from the baskets back to the perimeter, then it would just get refiltered. However, the laws of physics would have to be suspended for that to happen.
I have 12 canisters from 5 brands - the renas are my favorites, closely followed by the Sunsuns. Factoring price into it, the Sunsuns come out on top.
Most people like what they have, and so that's what they recommend. So as always, it's a matter of WHY. Sunsuns are my favorites because they are cheap, they hold a ton of media and they have built in surface skimmers.