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How much gypsum?
#519453 04/16/20 10:18 AM
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J
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My sediment pond is approximately 20,000 gallons. It is terribly muddy, like coffee with creamer. I don't want to use alum and quicklime if I can avoid it. How much gypsum would I need? How to spread the gypsum? Wet or dry?

Re: How much gypsum?
John Fitzgerald #519504 04/17/20 12:21 PM
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Bump.
I put a pinch of gypsum in a half gallon container of the sediment pond water yesterday, shook it up to dissolve. No clearing overnight. Today, I put a pinch of alum in. The water cleared within an hour. Maybe gypsum is ineffective on some ponds, IDK. Any thoughts on this?

Re: How much gypsum?
John Fitzgerald #519506 04/17/20 02:06 PM
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John, do you have fish in it?


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Re: How much gypsum?
John Fitzgerald #519508 04/17/20 02:22 PM
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Yes, some minnows, and lots of crawdads.

Re: How much gypsum?
John Fitzgerald #519509 04/17/20 02:50 PM
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Would they be much of a lost to you, if you used the alum and they didn't make it?


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Re: How much gypsum?
John Fitzgerald #519511 04/17/20 03:18 PM
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It's the only sustained minnow population I have right now, so I need them to survive. They have been living in muddy water for over a year, since I pumped out, killed, and restocked the sediment pond.

Re: How much gypsum?
John Fitzgerald #519518 04/17/20 07:59 PM
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gypsum doesn't work on my pond water in bucket tests. I'm about to grit my teeth and drop a bunch of money on alum. Hydrated lime is used to prevent the pH drop of alum from killing fish. Try the alum bucket test again with minnows in it. mine survived even without the lime.

Last edited by Redonthehead; 04/17/20 08:06 PM.

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Re: How much Alum- gypsum doesn't work
John Fitzgerald #519629 04/20/20 12:32 PM
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Gypsum did not work on the jar test, but a pinch of alum powder did, and cleared the jug of water in less than an hour. I only have a very small jar of medicinal alum. I need about 20 pounds of it to clear my sediment pond. Where could I get 20 pounds of powdered alum at a reasonable price? I aim to mix it with 10 pounds of quicklime in a tub and apply the slurry with a hose with a nozzle connected to a small water pump.

Last edited by John Fitzgerald; 04/20/20 01:32 PM.
Re: How much Alum- gypsum doesn't work
John Fitzgerald #519689 04/21/20 09:59 AM
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Some Co-ops have alum or can get it.
















Re: How much Alum- gypsum doesn't work
John Fitzgerald #519763 04/22/20 08:11 AM
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Our farmers co-op network around here cannot get alum except in the little 4 pound flower bed bags, and that's very expensive per pound.


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