Todd, appreciate the post with included info.
Looks like a few of my statements are incorrect based on your post.
Alum is the only choice for me because it's readily available and I've used enough now I know what to expect.
I used a friends Pete with a grain hopper to travel to northern Colorado to get 8 ton of gypsum I used for the 2 ponds I mentioned, that's the closest I could find at about 285 miles. That was a $3,000 dollar trip. Neither of the 2 ponds I wanted to try this in had access for a semi so it had to be rowed out and loaded with a front end loader into a small 3 ton dump truck to get to the site-in both cases.
Some of my information came from Texas A&M, seems some of that was incorrect.
Colloidal clay is not an issue here as we have less than 3% in most probe studies. Silty Loam and loess material in suspension with high Phos levels is our main issues.
With that said, Alum is my choice for that situation with hydrated lime.
I will by all means apologize for what I have posted that does not align with your information, and I wish I would have been aware of your expertise with this as I would have called and asked your advice for the 2 I used the gypsum in.
As it is, I have no good access to gypsum going forward although it sounds to me like it may be more beneficial to the impoundment in general.
Another part of this for me is we have very hard water in my region that tends to be high calcium hardness in it's natural state, which I'm not sure how that would be affected by more gypsum.
I was advised to use 1400-1800lbs per ac ft which seems to be in line with what you are saying but it would be nice to know why it didn't clear any in that 2 week period-don't know what I did wrong but obviously something wasn't right.
Again, I apologize for anything I posted that was incorrect info, I will gladly take criticism for my part.

Last edited by Snipe; 08/21/23 11:44 PM.
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