In the cabinet there is a self-made 60l filter tank,
which works on the principle of the Hamburg mat filter. Building I have copied in a aquarium Bauer and the calculations to the on hunting without secrets
made searchable formulas. As filter media serve me Blue filter mats coarse and fine, as well as some Filterwatte against airborne particles. The latter is now and then cleaned / replaced, the mats remain naturally untouched. Another chamber is filled with 4 l Siporax and about 3l Eheim Pro substrate.
The water passes via an overflow slot into the filter. This has, thanks to a second chamber via an intake just above the ground, which is aspirated from surface and ground simultaneously. Moreover, in the shaft a rough filter mat is still used, which serves as a pre-filter and is purified by from time to time to keep constant the outflow speed. Should this but once clogged, there are still a emergency drain.
Since the shutdown of the pump (eg power failure) about 2cm from the surface and the water in the pipes drain to the bottom of this has volume as a reserve in the filter to be present. In my case, the max 15L, the actual filter volume corresponds 40l, ie 11.4% of gross pelvic contents. After my research should be more than enough, please correct me if not. Then I can still make an external filter to.
In conjunction with the one near the top-mounted vents the overflow also provides for a good moving water surface, but can not replace Stömungspumpe.
The filter I have equipped with two return pumps.
1x EHEIM compact + 2000
adjusted to 1300 l / h
send water to an outlet on the top right behind the rear wall.
1x EHEIM compact
ca 350 l / h
This directs the water only Duch a UV clarifier and then hidden to an outlet at the bottom left at the front of the rock module, whereby the cavities are rinsed under the stone constructions, which seems to work very well (had tests made with granulated feed).
This pump hanging on a circuit different from the first, which has its own GFCI. Was not originally planned but it has offered since the outlet was already available in the immediate vicinity. Now I have time if the fuse blows, at least not an emergency filtration of 350l / h.
Both pumps together flush approximately four to five times the tank volume per hour through the filter. Here I follow the recommendation on malawi-guru.de
The positioning of the water inlet and outlets I have tried to ensure that the final crack is flushed in the aquarium, and the flow pump helps.