Yes, it was you that said that the exclusion zone doesn't matter...

Yes, it was you that said that the exclusion zone doesn't matter because its a liquid it will just flow all the way to the trench.

And the bottom of the pond is not clay dumb arse, it's the salt crust (yours is expensive plastic).

The salt builds up at 70cm per year. When there's too much the walls get raised or you dig it out and make a pile.

Your comment from early 2017: "How can it then hold the brine above the ground in the same material it drained from "......I'll leave you to ponder that (start here...maybe salt doesn't drain from salt)