At first I thought that you were exposing the whole pool (fish and all) to UV AND that you were thinking of spinning the whole pool as a centrifuge :) On Sat, Jan 15, 2011 at 7:17 PM, IVP wrote: > Hi all, > > I have a large outdoor fish pond (and a typo I just did, a fish > pong, which it does if you stir it up) that gets a lot of sun, so > made an algae killer with a 10W UV-C germicidal lamp > > http://dl.dropbox.com/u/18683201/UV-C_algae_killer.jpg > > (very reminiscent at night of Mr Burns in The Springfield Files. > Maybe I should call it Burnsy) > > As you can see, it will turn pea soup into clear water by > giving algae the Sunburn From Hell, which causes it to clump > in fluffy bits about 1mm big. That is the brown muck which > accumulates and needs flushing out. It's pretty 'sticky' too > and gradually coats anything it comes in contact with > > During the day the pond is murky because of this dead algae > generally scattering sunlight, but a night flash shows that the > water itself is pretty clear. Water is about 80cm deep > > http://dl.dropbox.com/u/18683201/day_night.jpg > > So I was looking around and found this site > > http://www.simplecentrifuge.com/gallery-series-17.html > > A high-speed centrifuge seems to a fairly good job of > removing the very light live algae, so it should be at least as > good with these bigger particles > > The question is though that some manual effort seems needed > to periodically remove the sludge and I'm wondering if anyone > has seen an automatic method that could be built at home. I > don't really have room for a settling tank, and have to keep the > health of the fish in mind too of course > > Any thoughts or suggestions appreciated > > I've thought about trying back-flushing, electrostatics (could > that be done in water ?), gravity, but not filtering. Filters clog > quickly and are just too high-maintenance > > Joe > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .