My tanks have been green/nasty all summer. I decided to do complete clean outs before winter. I drained the first one this afternoon moving the lilies and fish to a different tank. When I was ready to vacuum the bottom, I couldn't believe the holes I found. this tank had been holding water all summer. I have been looking at WalMart for weeks without any luck. I have one spare kiddie pool but went on line to hunt more. Not much luck...out-of-stock...most places. Sears/Kmart indicates that they have some, I hope they do.
I replaced two already this summer so hopefully there is just one more needing replaced. They will usually last 3 winters.