- Posts: 296
- Joined: Sat Jul 15, 2006 5:53 am
- Location: Fleet, Hampshire, England
should hopefully suck the nitrates/nitrates over the plant roots which I believe I read that plants can absorb???
Was thinking the membrane between the sand and gravel could be made out of the stuff mosquito screens are made of with holes cut to put plant roots through and stop fish getting at them.
Any thoughts from people with more experiance in this area?
- Martin Thoene
- Posts: 11185
- Joined: Wed Dec 28, 2005 5:38 am
- Location: Toronto.....Actually, I've been on LOL since September 1998
Never tried it, but basically under-gravel filters are called that for a good reason, and I wouldn't recommend them for loaches anyway.
here some pic´s of work from Olaf Deters regarding "why sand"...
Regarding filtration, Olav Deters, is explaning a slow running filter matt in great detail (calls it "Hamburg Matten-filter"). It is quite popular in "Deutschland".
- the waterspeed, which goes through the filter and therefore defines the size of the mat
(calculate water speed in filter with this german link http://deters-ing.de/Berechnungen/Berechnungen.htm go to: Die erforderliche Mattengröße eines Hamburger Mattenfilters
- the entire filter-mat(surface) is exposed to tank - open in water- (I personally modified that for my use, to maintain water-stream in the tank and built a housing fopr it - butr the logik staid the same as the original).
- driven by simple pump, sucking away the water behind the matt. water flows with even pressure-spreading through entire matt.
I have run a test tank with many fish and a modified version of such a filter.
never cleaned, only once in 1.5 years (except vacuuming off,when doing weekly waterchange!). Water values are great! The "bacteria home" does an absolute great job. I will use this for my new tank - now doubt - test was exceeding my expectations - and that with low maintanance...
some more links to the filter
... perhaps there is an english page... I will be glad to check, in case someone is interested... also can do quick translation of key data, if someone is just building a filter...
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