Cannister Hack: stringing two together

  • Nina_W
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Nina_W created the topic: Cannister Hack: stringing two together

My old cannister (a Penn Plax cascade) died, leaving me with a water tight cannister husk. In the mean time, I placed my dophin 1000 model on my tank to help the overhead filter keep up, it is woefully inadequate, but better than just the overhead on its own. I have about a month to wait for my new cannister to arrive.

My goal with this scheme is to combat the lack of sheer water pushing capacity with a larger media volume.

Considering the empty husk, and the identically sized dophin cannister, I was wondering if I couldn't attach the two to each other, making a dophin 1000 powered cannister with double the media space.

To do this, I would have water flow from the tank, into the husk, connect the outlet of the husk to the inlet of the dophin, and from the dophin back into the tank.

I have some concerns with this plan:
1) Will the dophin be powerful enough to draw water through both cannisters? From previous fiddling, I know it relies strongly on the venturi effect in the inlet pipe to keep things running smoothly.

2) It will be difficult to prime, there's no way around this as far as I can see.

3) Can one use a cannister as a husk? Will the cannister powerhead allow unrestricted water flow (if I remove the impeller)?
I took a good look at it, and took it apart as much as I could manage, and it seems that there are some sharp angles and odd narrowing parts of the outlet especially (where the impeller would have pushed water along). This cannot be removed and have the thing remain water tight.

Any ideas? Anyone done this before?
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Big-Ken replied the topic: Re: Cannister Hack: stringing two together

I would be worried that the added strain on the dolphin filter could cause premature failure, you could just take a regular power head in the tank and attach the inlet hose to it so it pumps the water to the canister and then pressure should return the water, would prolly work best if you can get the broken canister to sit above the tank
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  • Nina_W
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Nina_W replied the topic: Re: Cannister Hack: stringing two together

or use an external pump sitting on top of the cannister, below the tank (so suction down, pump up).

You're right, the strain is not good.
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Big-Ken replied the topic: Re: Cannister Hack: stringing two together

Yay the last thing you need is another filter going down, an external pump would be perfect
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  • JasonR
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JasonR replied the topic: Re: Cannister Hack: stringing two together

I'm with you guys for the most part on the strain factor although it could be limited depending on the type of media. If you were using mostly bio media such as ceramic rings, media resistance alone would be minimal. I guess what I'm getting at is you might see a canister chalk full of filter pads perform well for a long time even though there is much more resistance to flow than if the canister had a significant amount of bio media. Plus I think the impeller pump assemblies are designed to limit the possibility of burning the pump out due to the inevitable variability in media resistance based on media types used and the fact they get plugged with gunk increasing resistance more. I could be wrong on this but I think you'd be okay to try it with relatively clean media and just test flowrates before and after cobbling them together.
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Big-Ken replied the topic: Re: Cannister Hack: stringing two together

I see what you're saying Jason, its worth a try
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  • Nina_W
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Nina_W replied the topic: Re: Cannister Hack: stringing two together

well, setting it up this Saturday, and giving it an hour or two to see probably won't hurt anything, so I'll give it a go.

if it fails, I'll string up a pump to it and give that a go. :)
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Big-Ken replied the topic: Re: Cannister Hack: stringing two together

sounds like a plan, im curious to hear your results
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  • ehall67
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ehall67 replied the topic: Re: Cannister Hack: stringing two together

best of luck this will be interesting

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cebosound replied the topic: Re: Cannister Hack: stringing two together

hmmm. interesting idea.

but i would be worried about pressure leading to spillage or overflow. :S

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