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#508792 - 07/11/19 12:40 PM Alum sulfate
Mmilner Offline

Registered: 02/26/17
Posts: 7
Loc: Missouri
I have a new 1/8 ac pond. I want to clear up the muddy water. The pond is 12 feet in middle. How much alum sulfate and lime should I put in to get it cleared up?

#508795 - 07/11/19 03:34 PM Re: Alum sulfate [Re: Mmilner]
Redonthehead Offline

Registered: 04/03/07
Posts: 232
Loc: Missouri
Rainman's general rule is 200 lbs of alum followed by 100 lbs of hydrated lime per acre-foot of water. If you don't have fish yet you can skip the lime.

I suggest getting alum and 5 gallon buckets and do some trials. I found it took 1.1 grams of alum in 5 gallons of water to make it work quickly in my pond water. You must have a really good scale to accurately measure to a tenth of a gram. IIRC that was 157(?) lbs of alum per acre-foot. I have not treated mine. It seems to clear up OK without rain to about 24" visibility although still a tannish color. Still working on a BH issue.

Which part of MO are you? Have you found a source of alum already?

#508796 - 07/11/19 03:36 PM Re: Alum sulfate [Re: Mmilner]
Mmilner Offline

Registered: 02/26/17
Posts: 7
Loc: Missouri
I am in central MO in between St Louis and Columbia along I70.


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