It's a tube that runs around the perimeter of a small temporary pool which holds the sides up and therefore the water contained by floating on the water.
Currently I'm having to pump the damn thing up every day with one of those crappy foot pumps you usually get for an air mattress. I have purpose made vinyl repair kit for it, I just need to work out how to find the leak.
Submerging it in water isn't an option unless I want 1500 litres spilling out! I've toyed with the idea of putting some Stans sealant but I can't rotate it and the pressure must be pretty low so I doubt it would make it's way round several feet.
Any bodges or techniques used elsewhere?