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OT? -Microscopist ISO "portable pond pump"
Hi all, I'm one of the occasional lurkers - it helps me maintain my pond
scum aquarium for winter microscopy. Thanks for all the help. =) Anyway, here's my obligatory wierd question - if I wanted to go to the local lake, and hang a hose down into the water and pump small quantities though a filter paper and back into the lake for ten minutes or so... are there small pumps that could pump water like this up against a filter (high resistance, should probably be considered 'clogged')? I guess such a pump would have to somehow avoid building up a lot of pressure, maybe let water slip back though to avoid popping the filter paper? Being able to adjust the pressure it produces would be ideal. And it needs to not "chop up" the water - so obviously I am way out of my league here. When I do this in the lab, the filter only lets though about 100ml a minute. It's a 4" circle of paper, supported on a surface full of holes at the bottom of a fancy ceramic funnel, and vacuum pulls the water through. After awhile, the paper turns green, and holds lots of nifty little microscopic life - of the open-water variety. I can build the filter bit, but need suggestions as to pump technology. Are there little fountain pumps like this, for example? Any help appreciated! -cmb p.s. - Happy Thanksgiving! |
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