Philosophos -
I've used the Quiet One pumps in the past. Back then they were made by Rainbow LifeGard or somesuch. Not too bad for flow/noise/power consumption. I had one that died though and given that it was nearly silent to start with I didn't notice. That was with the old Red/Orange/Brown metal housing. I have no idea how the new pumps are or who actually makes them but they appear to be completely different to the older ones.
Johnny_ftm -
You are unlikely to damage the canister filter in this manner any more than if you ran your filter slightly clogged. If anything, the suction from the powerhead will likely ease the load on the cannister. There was a discussion somewhere on this site about using them inline in the past. I don't think durability was discussed, but it's fairly common in IT to have two fans in series inside important equipment. One reason is that if one fails the other will provide some flow, another is that both fans do not work as hard which makes them less likely to fail in the first place, a third reason is that both together give higher pressure at the output and thus more flow. I see no reason why pumps would be any different except that there's a definite mismatch in pump curves so you probably just get the same flow out of the cannister you'd get with or without the powerhead.
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S
I've used the Quiet One pumps in the past. Back then they were made by Rainbow LifeGard or somesuch. Not too bad for flow/noise/power consumption. I had one that died though and given that it was nearly silent to start with I didn't notice. That was with the old Red/Orange/Brown metal housing. I have no idea how the new pumps are or who actually makes them but they appear to be completely different to the older ones.
Johnny_ftm -
You are unlikely to damage the canister filter in this manner any more than if you ran your filter slightly clogged. If anything, the suction from the powerhead will likely ease the load on the cannister. There was a discussion somewhere on this site about using them inline in the past. I don't think durability was discussed, but it's fairly common in IT to have two fans in series inside important equipment. One reason is that if one fails the other will provide some flow, another is that both fans do not work as hard which makes them less likely to fail in the first place, a third reason is that both together give higher pressure at the output and thus more flow. I see no reason why pumps would be any different except that there's a definite mismatch in pump curves so you probably just get the same flow out of the cannister you'd get with or without the powerhead.
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S