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Re: [APD] Pressure pumps versus circulation pumps

What matters is the flow. The impeller assembly of the
"Pressure" pumps are better able to maintain a flow when
facing resistance to flow after the impeller. 

Since you are not trying to raise the elevation of water
from one container to another (which can easily present
several feet of head) and are not trying to force the water
through significant obstructions (like a dense filtering
medium) you should be able to do fine with either kind of
pump rated for the desired output against a small amount of
head. Other things being equal, a pressure pump should not
be necessary in the situation you describe.

Scott H.

--- Tom Wood <tomwood2 at flash_net> wrote:

> I'm adding some water circulation to my 90 gallon. I'm
> setting up an intake 
> bar to a separate canister filter along the back edge of
> the substrate. The 
> outputs from the water pump under discussion here will be
> at the back top 
> of the tank and pointed toward the front, hopefully
> rolling the water down 
> the front and back across the substrate pushing debris
> toward that intake 
> bar at the back. So this pump is just moving the water,
> the canister is 
> filtering it.
> The choice of external pumps comes in two flavors;
> pressure or circulation. 
> The pressure pumps are intended for use when pushing
> water through a filter 
> before returning it to the tank, the circulation pumps
> are for just 
> returning the water, such as from a sump. Although I will
> not be using a 
> filter, I do want the water to have some kick to it when
> entering the tank. 
> Typically the pressure pump of the same size as the
> circulation pump will 
> have a smaller return connection and a lower GPH rating
> at a given head.
> So, the question is, will I get more kick behind the
> lower GPH of the 
> pressure pump, or will the higher GPH of the circulation
> pump work better 
> to roll the water in the tank itself?
> TW
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> Aquatic-Plants at actwin_com
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