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Sampling water at depth
#530995 02/25/21 09:53 AM
Joined: Apr 2018
Posts: 198
Likes: 8
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Joined: Apr 2018
Posts: 198
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Looking to buy or make a sampler to capture samples of water below the surface, say down to eight feet deep or more. I bought a dissolved oxygen chemical based measuring kit; it seems to work quite well and is cheap in comparison to direct read systems. Also playing around with a small nano bubble diffuser in a small koi pond. In the big pond (1/10 acre lol), regular aerator diffusers are at six feet depth but the pond's deepest is eight feet. I understand that diffusers don't pump water from the deeper areas (?); I suppose because the deeper water may be cooler and more dense. I haven't tried sampling at depth yet. I see samplers on Amazon and industrial supply sites that cost hundreds, but the dipper design for sampling is not obvious.
DIY: Perhaps a 1/2 inch stick of pvc, stopper one end to hold air, un-stopper at depth, fill with water from the deep, re-stopper and pull up. Or a tube section with flappers at each end, both open going down, then closing to seal the sample when pulling up.
Any suggestions, designs, recommendations will be appreciated!


Dan McWhirter
DannyMac
Re: Sampling water at depth
DannyMac #531011 02/25/21 06:03 PM
Joined: Jan 2020
Posts: 25
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I struggled with the same problem last year. How to test for dissolved oxygen at various depths in my pond, except my pond is about 15' deep at the deepest point. I bought a very small battery powered submersible pump. Connected approximately 20 foot of small diameter plastic tubing and 2 conductor 18 or 20 gauge wire to the pump. I simply lower the pump to the desired depth, connect the battery terminals to the pump wiring, let the pump run a short while until I am sure that all of the water output is from the required depth and fill a plastic bottle with the desired water sample. I then take the water bottles that were taken at various depths from 1 to 15 feet back to my cabin for analysis. The test results have so far been very informative. I would estimate the total cost of my sampling system to be no more than $50.

1 member likes this: DannyMac
Re: Sampling water at depth
KenHorton #531016 02/25/21 07:41 PM
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Doggone if you don't have the greatest solution in my mind! I have a twelve volt water pump. And you only need a foot or two of pump head above the surface. Should be easy! Thank you!


Dan McWhirter
DannyMac
Re: Sampling water at depth
DannyMac #531074 02/26/21 10:06 AM
Joined: Jan 2009
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