08-05-2009, 12:06 PM
Join Date: May 2006
Location: Portland, Or
iTrader Positive Rating: 100%
| | Re: Needle wheel pump
Adding a pump to the return of a canister significantly boosts the canister output. Running a closed loop will increase water movement in the tank even further.
The main benefits over a ceramic disk are bubble size and lack of cleaning. Some people claim to have ceramic diffusers that produce ultrafine, mist like bubbles, but I have yet to see one. A plumbed needlewheel produces extremely small bubbles.
Ceramic diffusers do best with regular cleaning, if needlewheel pumps ever need to be cleaned at all, it is very infrequent.
Overall, it is just another way of getting CO2 into the tank. If you already have adequate water movement, and a well functioning ceramic disc that you don't mind cleaning, then there really is no benefit.