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! |
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! I am also a lurker and extremely rare poster. I am assuming that you are a biology teacher, as am I. Anyway, what immediately came to my mind (and because it was immediate may mean it is not workable) is to use just what you suggested, a fountain pump, or perhaps the very small Fluval. You could partially obstruct the aperture to achiehe the flow you want, or collect your flora on the inflow end on a filter medium of your choosing. Powering the filter at the lake would be the portability issue. Were you planning on using a power inverter? Does anyone know if there would be a safety issue with this? Certainly electrical cords around an unpredictable water source like a like would be cause for concern. |
On Fri, 26 Nov 2004 16:56:32 GMT, "c-bee1"
wrote: 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! Some small aquarium pumps at: http://petsolutions.com/search.asp?t=ss&ss=pump&x=0&y=0 They are meant for 120VAC, so an inverter would be needed if you are running it off a boat/car battery. In the book "Dynamic Aquaria, Building Living Ecosystems" the authors talk about the problems with running small organisms through pumps, they get torn up and die. If that's not a problem, then good. As for the filter pressure what occurs to me is to put a funnel and the filter paper in the bottom of a bucket, then fill the bucket with pond water. -- - Charles - -does not play well with others |
All times are GMT +1. The time now is 03:54 PM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
GardenBanter