This year we have to replace our vinyl liner in our in ground pool. While we are getting into this repair we thought it would also be a good time to bring the deep end up to 5’. Our problem is we don’t know what to fill the deep end with. We had to replace some pipes (of course under concrete) last year & still have a pile of concrete that we thought about using along with sand to fill then finishing with sand & topping with 3 inches of vermiculite. Any and all comments would greatly be appreciated. Sharon