Good without laughing, I would like to make a mini pond of a few m² to improve the biodiversity of my garden... only here, despite the clay aspect of the earth and mud (and the presence of 5 ponds within a radius of 500m, one of which is not fed at all... the others are but with entrance / exit) , the water ends up getting the hell out (4 to 5 hours when it is full, that is to say that it touches the inclined edges, about 20 cm high)...
In short, for the moment it is not too waterproof... So the easy solution is to fuck an EPDM tarpaulin... I don't want it...
Wouldn't there be a "natural" product to seal a pool? Clay sold by the m3? I think it's the right solution but how many cm would you need?
After 2 or 3 fillings and 2 hours of earthworks, this is what it looks like:
