I got a used set of these on CL this past week. After cleaning them with a pressure washer, they're good as new.
The instructions state that you should put sand in the white side panels to weigh the unit down, but this used unit appears empty, as if the prior owner didn't put anything in there. I just tried to put them in the pool as-is, and while the gray steps have holes to take on water, the white side panels appear sealed off and so the unit floated badly.
I'd rather not go buy a bunch of sand to funnel in, so I was wondering if anyone had ever just dropped a hose in the side panels and filled them with water instead. Wouldn't that work? And I could drop in a bit of bleach to keep anything from growing? The thought is that removal of that water would be much easier at year-end.
Another thought...screwing holes in the side panels so that they, too, take on water like the steps do. Would that work?