01-10-2008, 01:18 PM
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I'm running a 2217 and a 2215 on two different tanks and I haven't had that problem. Suggestions:
1) Double up on your mechanical filtration media at the bottom, and cut your water polishing floss out or in half (and adjust biofiltration to fit).
2) Backflush at least every three months, more frequently if you can. With the quick release taps it's still easier than cleaning an HOB. Just take the top off, point the innlet down into a sink, and let the water out the inlet. Then take a couple of gallons of water from the aquarium and pour it in the top of the filter to let it run out the inlet. Turn off the taps and fill it up. Hook it back up, turn the taps back on, and plug it in. It'll run noisy for a minute, then quiet back to nothing.
3) Check that the impeller isn't clogged every three months, and clean it if it is. Careful though, the axel is ceramic.
4) Put a sponge pre-flter on the intake (use a coarse one or you'll have the same problem for different reasons.) This is a last resort and amounts to giving up on using the cannister for mechanical filtration. Course, if you do it this way you can pretty much cut out the mechanical filtration and go with efi-fix and filter floss to get really crystal clear water.