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Undergravel filters
- Thread starter foxfish
- Start date
X3NiTH
Member
- Joined
- 13 Apr 2014
- Messages
- 1,647
No, direct gas injection under low pressure, the GoreTex/PerTex pore size is small enough to be a barrier for water so when you pass co2 gas into the bladder it can diffuse through these pores and because you can make the bag fit the entire area on the bottom plenum/ugf the corresponding substrate area above the bladder will saturate with co2 as it diffuses/bubbles through. Does that make sense?
akwarium
Member
In most of my small projects I don't add co2.
if I do the effect is not different then in any other setup with a different filter method.
Water movement in an aquarium is strongest where it is actually moved. so near the pump. If you have a spraybar more water will go trough the first hole then to last one. If you have a UGF more water will flow to the substrate near the pipe where water is blown in or sucked out, then on the other side of the tank.
if you want to distribute CO2 and nutrients better, move more water.
Well that would depend on the style of under gravel filter?
In my case a suspended, perforated plate allows for more even distribution If the return water is jetted under the plate.
I have also used a matrix of perforated pipe under a perforated plate and fed the water into the pipe… a sort of mutable spray bars under the plate.
Next up is the type of substrate as fine sand may well pressurise the under gavel stytem and cause a build up of C02 where as an open media like cat litter will allow a more even flow.
I have experimented with both those styles and they both worked very well!
The ideal is to introduce an even (ish) distribution on gas up through the media and then circulate the main tank volume.
I found a few picture but not really the ones I wanted as most were taken many years ago!
In my case a suspended, perforated plate allows for more even distribution If the return water is jetted under the plate.
I have also used a matrix of perforated pipe under a perforated plate and fed the water into the pipe… a sort of mutable spray bars under the plate.
Next up is the type of substrate as fine sand may well pressurise the under gavel stytem and cause a build up of C02 where as an open media like cat litter will allow a more even flow.
I have experimented with both those styles and they both worked very well!
The ideal is to introduce an even (ish) distribution on gas up through the media and then circulate the main tank volume.
I found a few picture but not really the ones I wanted as most were taken many years ago!
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