Trying to see if our new Intex 18x52 will last longer this year vs the Coleman last year which leaked within weeks and a bad pump a few months later. I plan on putting this pool up within a few days and on the concrete pad (9 years old and solid) there are the usual expansion joints in the concrete. Curious if I should place some sand in those joints to prevent the liner from filling in those areas. Or other remedy? Additionally, I see the Harbor Freight tarps come up, are the silver tarps the recommended tarp for under the pool? I know the silly tarp which comes with the pool will last one month tops.