An old-skool filter from the 1970s. Also called an undergravel filter (UGF).
It is not necessary to do the whole bottom, as long as you stay about 5cm away from the sides and front, there are no problems.
- XS set consists of : 6 bottom filter plates and 1 riser tube with air stone and 50cm air hose.
- S set includes : 12 bottom filter plates and 1 riser tube with air stone and 50cm air hose.
- M set includes : 20 bottom filter plates and 1 riser tube with air stone and 50cm air hose.
- L set includes : 32 bottom filter plates and 2 riser tubes with air stone and 50cm air hose.
The riser tube is adjustable in height min 31.5 cm and max 50 cm. By shortening the tubes, you can make it lower than 31.5 cm.
There are loose boards and risers for sale, as well as root cloth if the gravel is so fine that it can fall through the grid. (3mm and smaller)
Read more about these filters here : Beginner’s guide soil filters
There are three ways to use the filter:
- With the riser powered by air.
- With a powerhead.
- As the intake of your external filter.
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