Last week we put up our Intex 15 x 42 frame pool. I spent two days meticulously leveling the ground and tossing out stones. We have clay soil and after a very heavy flash flood yesterday, the ground under our pool shifted a little. We put a light layer of sand down after the initial layering, but only a light amount, with the tarp over it. I am assuming that the combination of weight of the pool and the saturation of the ground beneath from rains caused new rocks to work up. Anyways, the rock I stepped on today is quite sharp on one side and immediately punctured the liner a little when I found it while walking. I have the patch pieces from the Intex kit that was included with the purchase but I had to go to the local pool supply store for the under water cement. The employee recommended that I push the rock down forcifully with a baseball bat and then patch it over with three layers. I was wondering however, if I could do an initial patch with the regular liner and then use the thicker, sturdier liner patch from the pool side to cover the hole on the bottom. I am just very concerned with this rock making its way up to put another hole through the patches- and since the liner on the sides is so much sturdier I was thinking it would stand up to the rock better. Would it adhere well on the bottom you think? I am really quite aggravated- next year I will get the Gorilla pad. Unfortunately I only just learned about it and draining all the water onto the lawn to lay a new pad on the bottom is not an option :x Thanks so very much for help. This is my "test" pool. My hubby says if we can take care of this pool all summer he will give into a more permanent one with a deck in the future. So I NEED to get this fixed quick! 
