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#485967 - 02/08/18 04:04 PM Applying Bentonite
Nick 2009 Offline

Registered: 01/11/18
Posts: 5
Loc: Iowa
I have installed liners in leaking ponds in the past and sealed up a few bad spots with bentonite but never did an entire pond with bentonite before, I know how much to put down but was wondering if spreading soil over it after tilling and compacting is recommended, I have seen it both ways but any advice or past experiences would be greatly appreciated.

#485970 - 02/08/18 04:55 PM Re: Applying Bentonite [Re: Nick 2009]
Rainman Offline
Field Correspondent
Hall of Fame


Registered: 06/06/07
Posts: 7026
Loc: St Louis, MO area
Nick, Bentonite tends to become colloidal and not settle out of the water....I'd add a foot of good compacted soil over the properly tilled/compacted bentonite mix if I were doing the job.


#486000 - 02/09/18 08:23 AM Re: Applying Bentonite [Re: Nick 2009]
TGW1 Offline

Registered: 09/19/14
Posts: 2884
Loc: Harrison Co. Texas
I have a lot of experience with bentonite but in a different area than ponds. I look at it like this. Bentonite is a clay and one wants a layer of clay on the bottom of the pond so it will hold water. I would add a layer of clay, not disk because that would dilute the clay, pac the clay down and then I might add some soil on top of the clay to reduce the bentonite mixing in the water and becoming a colloidal or water suspension problem. I am no pond seepage expert but that is how I would do it.
Do not judge me by the politicians in my City, State or Federal Government.


#486022 - 02/09/18 08:01 PM Re: Applying Bentonite [Re: Nick 2009]
Dave Davidson1 Offline

Registered: 01/04/06
Posts: 14045
Loc: Hurst & Bowie, Texas
Due to my past experience, I have no advice. But, you can call Texas sodium bentonite for advice. The owners name is George. Don't remember his last name. Nice guy.

Edited by Dave Davidson1 (02/09/18 08:04 PM)
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

#486292 - 02/19/18 07:27 AM Re: Applying Bentonite [Re: Nick 2009]
Archer82 Offline

Registered: 09/08/15
Posts: 40
Loc: Kansas (KS)
I don't think you would hurt anything by adding additional clay on top of the bentonite. I just finished up patching a rocky area in my pond that I believed was leaking. What I did was remove dirt over the rock, applied bentonite in power form and covered it back up with dirt. I then used my disc to work some in on top of the dirt too and pack best I could with my tractor. Then I pulled in clay from above the leak for added protection.


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