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Joined: Oct 2015
Posts: 2,424 Likes: 19
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OP
Joined: Oct 2015
Posts: 2,424 Likes: 19 |
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?
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Joined: Oct 2015
Posts: 2,424 Likes: 19
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OP
Joined: Oct 2015
Posts: 2,424 Likes: 19 |
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?
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Joined: Oct 2016
Posts: 1,108 Likes: 76
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Joined: Oct 2016
Posts: 1,108 Likes: 76 |
John, do you have fish in it?
Bob
I Subscribe To Pond Boss
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Joined: Oct 2015
Posts: 2,424 Likes: 19
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OP
Joined: Oct 2015
Posts: 2,424 Likes: 19 |
Yes, some minnows, and lots of crawdads.
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Joined: Oct 2016
Posts: 1,108 Likes: 76
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Joined: Oct 2016
Posts: 1,108 Likes: 76 |
Would they be much of a lost to you, if you used the alum and they didn't make it?
Bob
I Subscribe To Pond Boss
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Joined: Oct 2015
Posts: 2,424 Likes: 19
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OP
Joined: Oct 2015
Posts: 2,424 Likes: 19 |
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.
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Joined: Apr 2007
Posts: 274 Likes: 5
Fingerling
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Fingerling
Joined: Apr 2007
Posts: 274 Likes: 5 |
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 09:06 PM.
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Joined: Oct 2015
Posts: 2,424 Likes: 19
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OP
Joined: Oct 2015
Posts: 2,424 Likes: 19 |
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 02:32 PM.
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Joined: Mar 2005
Posts: 21,490 Likes: 265
Moderator Hall of Fame 2014 Lunker
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Moderator Hall of Fame 2014 Lunker
Joined: Mar 2005
Posts: 21,490 Likes: 265 |
Some Co-ops have alum or can get it.
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Joined: Oct 2015
Posts: 2,424 Likes: 19
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OP
Joined: Oct 2015
Posts: 2,424 Likes: 19 |
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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