I live in Northern Ky. and have a cistern on my farm. In this neck of the woods we call them jug or bottle cisterns because of the shape. It is about 21' deep and about 11' in diameter at the bottom. It normally holds water to about 7' from the top. If it fills any more than that it will return to the 7' from the top level in a couple of days, but doesn't go any lower except with use. The cistern has rock walls and is plastered.Would there be any chemical or solution or powder that expands in a crack that would slow or stop the leak? Thanks, Ellis
 
Bentonite is an expansive clay that works like that. Available in several forms, excellent water-proofing. Our state Health Dept. strongly recommends it for water wells to keep out surface water.
 
Yes, bentonite, it comes in several grades, you can get it from drillers supply, they might have a branch near you. or ask a well driller...
 
I would also vote for the hydraulic cement. Bentonite is just clay, basically dirt but it should work.
 
Are you sure there is not an overflow drain in it? Ours will flow to a drain that is 600ft from the house when full.
 
Here (Oz) we can get this product for concrete tanks

http://www.crystalfix.com.au/

Seems to work - we've done the reinforce as they recommend with deformed bar on one concrete tank (above ground) and have cut back from a torrent to a dribble.

A professional concreter should be able to point you your side
 
I don't think this stuff expands but it does cover hair line cracks well.

http://www.chargar.com/Products/prod_na.html
 
sounds like your water table is at the 7' mark. you can try the hydralic cement but if you don't know where the leek is you will be chasing it forever.
 

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