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Joined: Apr 2007
Posts: 49
Lunker
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Lunker
Joined: Apr 2007
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my pond is 7 months old and is still muddy. I was thinking about trying alum or gypsum to solve this problem. The pond is approx. 1/2 acre and is 7.5' deep at the deep end and 3' at the shallow end, so I guess an average depth would be 5'. How much alum or gypsum would I need and where do you get it? What would be the best to use?
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Joined: Feb 2006
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Moderator Lunker
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Moderator Lunker
Joined: Feb 2006
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Here is a link to help you.I think that alum will change the pH of the water if your alkalinity is low. So if you already have fish, gypsum may be the way to go. Do a search of alum and gypsum on here. That should help you decide. Good luck. http://wildlife.tamu.edu/publications/taexponds/0905a.pdf
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Joined: Mar 2005
Posts: 21,493 Likes: 266
Moderator Hall of Fame 2014 Lunker
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Moderator Hall of Fame 2014 Lunker
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Read this and note in particular the quoted part below. So find out your alkalinity first. http://srac.tamu.edu/tmppdfs/13452410-46...a25e1fc69a57d1b Although not nearly as effective as alum, gypsum also can be used to control turbidity but without the loss of alkalinity. Gypsum must be added to achieve a concentration of 100 to 300 mg/L for effective turbidity control. For most ponds, gypsum application rates will range from about 1,000 to 2,000 pounds per acre (Fig. 4). In hard-water ponds (calcium hardness greater than 50 mg/L), the water is nearly saturated with calcium and gypsum may be ineffective. In that situation, alum will be the only effective coagulant.
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Joined: Jan 2006
Posts: 16,053 Likes: 277
Moderator Lunker
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Moderator Lunker
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A couple of years ago, I contacted US Gypsum for their advice and posted the info here but haven't been able to find it.
Look on the web and E-mail them for advice.
It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.
Without a sense of urgency, Nothing ever gets done.
Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP
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Joined: Mar 2005
Posts: 21,493 Likes: 266
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Moderator Hall of Fame 2014 Lunker
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Joined: Feb 2006
Posts: 210
Lunker
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Lunker
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Another alternate to alum is to use one of the polymer versions of aluminum salts. These include poly-aluminum chloride (PAC) or aluminum chlorhydrate (PCH). Both of these are liquids and so are more easily dispersed. The other advantage is that they do not alter pH like alum, but have the same +3 charge, and because they are polymer chains of aluminum, have more charge density. You should be able to buy either from an industrial chemical supplier in most larger cities. The cost of PAC or PCH will likely be double that of alum on a per lb. of aluminum, but the dosage will be 25% lower and will disperse better so you will see better results. Jar test to see how much you need, but target 10-15 ppm.
Mike
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