They take the place of a solar bubble cover and are about 5 feet in diameter. About $25 or less, each. Who has used them and how do you like them? Thank you Beer 4U2

Hi all - I'm new to the site - thanks in advance :) Just bought a house in Ontario Canada, and it has a pool that needs a new liner. The pool is about 20 yrs old, and in decent shape. 36x18, steel 42" walls, concrete floor and deep end bowl. I do have some limited experience in replacing a liner so that part doesn't scare me. I just drained the pool and removed the old liner. I found the concrete bowl in the deep end had some previous repairs, and 2 cracks are allowing water to stream in. I guess I'll attempt to fill with hyd. cement. How long can I leave the water out of the pool while I do these repairs? Do I need to be concerned that the pool walls could collapse, or the pool could pop out of the ground, as I've read in other threads from guys in Florida? Any advice would be appreciated!