Great Product! We purchased this for our new pool this year to put under the stairs we purchased. The material is very heavy duty and I have no worries about this ruining the liner. I do try to pick it up every now and then to scrub under it to prevent any buildup. It doesn't "cling" to the liner, so the edges definitely need to be cleaned. Does it's job!
Rating: [5 of 5 Stars!]