When I'm past my present state of exhaustion, I might script some more details. For now, here's the result of around 9 tonnes of bentonite added, by wheel-barrow and manual labour.
The water is pouring in and the level is slowly rising. We are having hot, strong, dessicating winds, day and night, presently, so evaporation rates are high. That's borne out by the level drop in the swimming pool.
But it does look like - for me - it's Pond Mission Exhaustible, rather than impossible.
So I'm happy with that. Nine years in the making! Phew!
