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Old 07-28-2007, 09:39 AM   #1 (permalink)
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Default questions about canister filter

I just got my rena filstar xp1 today for $60. Yay! In the manual it says that it must be 24" below the tank. Must that be true? Will it not work at the same level?

Also, would it work in a paludarium type setup i.e. does the output need to be in the water?

Last, if you were to run diy co2 through the filter, where would you put the co2? In the inlet tube under the water? Or is there a better place? thank you.
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Old 07-28-2007, 09:53 AM   #2 (permalink)
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Default Re: questions about canister filter

Priming of a Rena Filstar filter requires that the filter be far enough below the tank to have the head necessary to drive water down thru the filter. I think that is the reason for the 24" number. I see no reason why it wouldn't work with the outlet out of the water, once it it primed, but I'm not as sure it will prime with the outlet out of the water. And, I wouldn't run the CO2 thru the filter - I would use an external reactor, which is absurdly simple to make, instead. But, if the outlet is out of the water, the CO2 would mostly be degassed by the splashing water in the tank.
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Old 07-28-2007, 10:55 AM   #3 (permalink)
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Default Re: questions about canister filter

I guess I should have been clear on my situation as I can see how what I wrote doesn't quite make sense.

I have three tanks in close proximity. A 55gal paludarium is on top with a 10g and 20g on ground level. The 20g is what i got the filter for originally. If it is not going to work being at the same level, I would then like to use the filter on the 55g and incorporate the outlet in a waterfall feature.

I guess i could try it on the 20g and see if it will pump?
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Old 07-30-2007, 02:13 AM   #4 (permalink)
 
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Default Re: questions about canister filter

it wont pump dude you HAVE to prime the thing first or all youll get is alot of noise.theres no where you could put the thing???even if its on the floor?i think using anything but a sponge in your other tank would be an over kill.not only that xp's are my favs and you will love it!!!!
oh heres some reactor links enjoy
http://www.csd.net/~cgadd/aqua/diy_reactor.htm
http://www.csd.net/~cgadd/aqua/diy_reactor.htm
theyre all the same concept but what ever you do DONT feed co2 through ur intake it will eat away filter parts over time itll be fine for a while then one day shot filter or alot of parts to replace
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Old 07-30-2007, 08:05 AM   #5 (permalink)
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Default Re: questions about canister filter

I'm guessing that the 24" rule is to prevent cavitation. If the pump cavitates, you lose flow and cause excessive wear on the moving parts.
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Old 07-30-2007, 01:59 PM   #6 (permalink)
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Default Re: questions about canister filter

Quote:
Originally Posted by Squawkbert View Post
I'm guessing that the 24" rule is to prevent cavitation. If the pump cavitates, you lose flow and cause excessive wear on the moving parts.
I think this is right. The little pumps in these filters move a lot of water, but don't do much in the way of suction or pressure generating. So, they depend on the inlet water being siphoned in by having the pump below the water level in the tank.
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