On Sat, 20 Nov 2004 11:11:44 -0600, "Limnophile"
wrote:


"Billy" wrote in message
...

"Donegal Paul" wrote in
message ...
| Hi all, im a little confused by these, are they actually of any
real benefit
| at all?
|

They don't REMOVE ammonia and nitrites persay.
What they do is provide an excellent environment for the
bacterium that process the waste in your tank. The alternating
immersion\emmersion seems to be superior to media that is always
underwater.


They are pretty good when they work. You may have problems with thw wheel
getting stuck, or not turning if water flow decreases. I tried a few, one
worked well, 2 kept getting stuck.

Limnophile



I have two Penguins with a total of 4 wheels. I agree with
Limnophile, the sticking is frustrating. I can generally get the
wheel turning by wiping a finger along the bottom of the spillway and
the wheel. I suspect something hangs up on the wheel cartridge making
that side heavier.

dick