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Advantage to UG filter?

1327 Views 11 Replies 8 Participants Last post by  Seattle_Aquarist
The 55 gallon second-hand tank I bought a few months ago came with a UG filter installed under the gravel. I'm about to do a kitty litter/sand substrate in there because I hate the way the cheap black gravel that came in it looks and the plants don't like it much either. I guess I just want to know if I should be using the UG filter? I have two Penguin 400 HOBs on there. They seem to be more than adequate for filtration. Is there any advantage to using the UGF and is it even possible with the sand? I am thinking about just pulling it and RAOKing it.
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There is no advantage to using an UGF. They do very little in terms of filtration. I'd ditch it and stick with the HOBs if I were you.
UGF used to be a good way to grow a pretty impressive bio filter. The constant water movement through loose substrate would keep the gravel very well aerated, and the high oxygen is very good part of growing the nitrifying bacteria.

They need to be kept clean, though, and I found that pretty difficult.

They will not work with finer substrate.

There are other ways, now, to grow as much nitrifying bacteria as any planted tank needs. Today's HOB and canister filters are much better than the styles they had when the UGF was designed.

I have seen one concept of UGF that might be a way to make the concept valid, again, but I would not bother.
Thanks for the feedback AZFishKid and Diana! I will just pull it out and maybe someone with a reef-type gravel setup or cichlids can make use of it. :) I love my HOBs and they seem to keep the water crystal-clear. The fish also really seem to love the flow they create, so I'll just still with them.
Yepper, I ditto all above. If you have bigger plants, the UGF's will get absolutely snarled with plant roots. If you ever want to re-scape, you'll end up cutting off big hunks of root which stresses the plant more than necessary
I think HOB is good, canister is great, and sponge filters are great for shrimp/bare-minimum/quarantine type tanks.
Some of use UGF in akadama drl substrate because it keeps the ph stable day/night. Is like 5.9 all the time. This kind of UGFs are usually DIY with PVC pipes tho.

Otherwise, there is a lot of naysay about those plaque ones and specially is run by Airstones. That said, in an older thread some people shared pictures of their tanks with airstone powered UGFs in cheapo gravel and they looked healthy.

There is the reverse flow version that is supposed to not clog but I have no experience with it.

As in everything in this forum, I would ask to people "have you had one? How did that work for you?", everyone is trying to help but not everyone talk about their own experience here.

However, if you aren't planning on keeping high end shrimpies with acidic preferences then ditch it, there is no proof that the flow of o2 rich water helps or bothers the microbial part of the root system, like ectoenzymes and phosphorus fixing lil dudes... ;) roots do provide enough o2 to them anyways.

You can also use it and share your "did it clog or not" experience to us, I'll be interested to know. :)
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aaaand cue another 6 page thread about whether or not UG filters are worthwhile.
Search function, what's that?
aaaand cue another 6 page thread about whether or not UG filters are worthwhile.
Search function, what's that?
Lol! That's right! Hehe
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Hello HighDesert,

I suspect that most people who claim a UFG doesn't work, or can't be used in a planted aquarium have never tried it. It provides a huge amount of surface area for nitrifying bacteria and eliminates 'dead areas' in the substrate where hydrogen sulfide gas can build up and cause fish deaths when released. One picture is worth 1000 words....

45 Gal with UGF


30 Gal with UGF


"There is a principle which is a bar against all information, which is proof against all arguments and which cannot fail to keep a man in everlasting ignorance — that principle is contempt prior to investigation." William Paley
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I tried running the RUGF (Reverse Under Gravel Filter) and even then it did not stay very clean. On cleaning day I would pump a lot of water into the 'uptubes' (Of course they are the 'down tubes' when running reversed) and blow a lot more debris into the water.

Finally I just pulled them all out, and gave up on them. They work nicely in a sump to hold the sponges where I want them.
I tried running the RUGF (Reverse Under Gravel Filter) and even then it did not stay very clean. On cleaning day I would pump a lot of water into the 'uptubes' (Of course they are the 'down tubes' when running reversed) and blow a lot more debris into the water.
Hi Diana,

Why did you pump a lot of water down the tubes?
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