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Re: [APD] Using powerheads for a CO2 diffuser

These are often used to maintain the siphon on, for
example, CPR Aquatic type overflows -- the  low velocity
type that tend to collect air bubbles and lose their
siphon. They are also used on venturi protein skimmers.

TAAM, Inc (Manufacturer of Rio pumps) also sells a
conversion kit for the 600-800 and the 1700 models, called
the RVT Venturi Kit and sometimes called the Rejuvenation
Venturi, such as shown here:


These feed the gas (air or whatever you've got)  line
directly into the pump volute.

Aquarium System Maxijet used to make a similar conversion
device that had a better rep for a while, called the
Maxijet Turbo Venturi Kit. I think those are harder to find
but this place still sells them:


With a little thought, you can figure several DIY ways to
accomplish the same thing with any powerhead that has an
intake screen -- which, come to think of it, might be why
it's so hard to find a store that carries this stuff.
Taam's concentration on new pump products has been on
higher pressure rather than highe velocity pumps, so I
wouldn't bet on them coming out with improvements on the
thinner impellers.

Have bubbles, have fun,
Scott H.

--- Thomas Barr <tcbiii at yahoo_com> wrote:

> I have been using a powerhead for a diffuser in  one of
> my tanks. The CO2 is fed into the intake. The venturi is
> still  there also making a loop, but the Rio 600-800
> series pumps have a  special impeller, instead of 4 flat
> blades, these have 6 flexible  blades that are optimized
> for fine bubble production.
>   Note these are not the same regular Rio 600/800 pumps.
>   No modification is needed, simply attach the CO2 line
> to the inlet and connect the other inlet to the the
> venturi.
>   These are superior to common powerheads for this
> application and  production of mist.The key is the
> impeller, these are quite good, but  ideally one of those
> needle wheel skimmer impellers would be best.Maybe  they
> will sell those later.
>   If you direct the powerhead down into the plant beds
> from near the top of the tank , this will give you the
> best efficiecy.
>   No reactor cup needed(plant leaves act as a baffle),
> simply plug the  powerhaed into the light timer. CO
> 2comes on when you need it, off when  you don't.
>   Cost 15-20$, ease of use: very easy for both gas tanks
> or DIY CO2 sources.
>   I would also suggest these for driving reactors if they
> are in the gph flow range you need. 
>   Regards, 
>   Tom Barr
>   www.BarrReport.com
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