The Metaframe Dynaflow filters were the best filters ever made for aquariums. Here is why/
They never leak because there is no hole in the bottom. A magnet drove the impeller.
They pump filtered water. The filter is fed by a siphon that puts the water on top of the filter media. The pump pumped the filtered water from the bottom of the media back into the aquarium. I never had an impeller jam or get clogged up with gunk.
They did not kill fry. If fry got sucked into the filter, they would hang out in the water on top of the filter media until you scooped them out. While they were in the filter, they were the best-fed fish in the aquarium.
Unless the siphons were broken when you had a power failure, they would always restart when the power came back on.
Dynaflow filters don't run over. Because it is fed by a siphon, the water level in the filter can never be higher than the water in the aquarium.
You can always tell when the media needs changing. There was no bypass so the flow would get slower the more the media clogged. When it got too slow, you changed or cleaned the media.
You could use any media you like. I use sponges and filter floss in mine. I used sponges well before there were sponge filters in the aquarium trade. A 1/2-inch layer of foam on top to catch the course stuff and filter floss on the bottom to get the rest.
The tubing on the Dynaflow filters was bent tubing for the returns and the siphons. It was a standard-size tubing that you could buy and make siphon tubes. Combine this with the adjustable returns, and you could almost eliminate refiltering the water that just came out of the filter. I don't know of any modern filter that can do this.
Curved/bent tubing is much easier to clean.
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