Tropical Fish Keeping - Aquarium fish care and resources

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hamdogg08 05-10-2007 10:37 PM

Fluidized bed filter?
I was just wondering if anyone is familiar with/has used a fluidized bed filter. I've seen one at a LFS, but they don't seem to be too popular. Why don't you see more of these things around? Are they ineffective or something? The seem to be fairly inexpenive, and from what little research i've done, a pound of sand filters about 100 gallons. (if these are not used for freshwater and only for salt, sorry for posting in the wrong section)

Robnjo 05-10-2007 11:43 PM

I run 2 to on the side of my sump, I have them both in-line and am thinking of putting another in the same line just to slow the flow down a bit. I love them.
*Though this is on a Saltwater system.

hamdogg08 05-11-2007 09:59 AM

How would I go about hooking one up? Do they have their own pumps? What about hooking it up to a canister filter? Is there a way to control the flow of water to avoid all the sand just washing out of the filter and into the tank?

Rue 05-11-2007 10:06 AM

They're very effective...I think the problem is when the power goes out...

...when the power goes out, the bed collapses...if the power is out for more than a second, the bed won't resuspend...

...if the power goes out for a long period of time, your bacteria die due to lack of oxygen...

hamdogg08 05-11-2007 10:50 AM

What about getting a cheap little canister filter (the rena xp1 is only like $60 and pumps 250 gph) and put the output into a fluidized bed filter. I saw one on foster/smith rated for 300 gallon aquariums and had a suggested flow of 135 gph for only $60. If the power goes out, I could put ammonia-removing media in the canister for a week or two so the tank doesn't get killed off. How does that plan sound? Oh, and the tank that I put it on would be a 75 gallon planted tank.

Robnjo 05-11-2007 06:51 PM

I have my 2 in-line with a 16watt UV which a 2000lph Otto pump pushes them nicely. They run 24/7 and we have a 5kva genset for the house, if the power goes off.
you need a pump to run them/it or you could just put them in-line with your filter, like you said.
Coral sand is the best in them.

hamdogg08 05-11-2007 10:53 PM

What are good brands/models to buy? Also, why would you want to slow the flow down? I don't want to have to little or too much flow going in the sistem, and I don't really know how to tell what is overload.

Robnjo 05-11-2007 11:19 PM

The slower I can get it without it stopping the sand or burning out the pump, the more contact time in the unit the better :wink:...I am running a 2000LPH pump which is way to fast for contact time at the moment.

hamdogg08 05-12-2007 09:53 AM

Do they usually have a valve on them to regulate the flow rate? Is there ever an issue of having too much water flowing through, and washing the sand out of the filter?

Robnjo 05-13-2007 02:50 AM

There is no valve on them, they are rated with a ideal pump size.there are two sizes here in Oz. I had a spare 2000ltr pump and with the 2 units and UV set-up I have a good flow but want to slow it down a tad, which a 3rd unit will do just fine.
Brands, I haven't herd of a bad one...

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