We just moved into a new house with a pool here in Louisiana. Luckily I have a friend that has a side business of cleaning pools so he is very knowledgeable. My pump/filter is less than a year old and the liner is only a few years old. My pool is 36x18 with a depth of 8ft. at the deep end. I am going to purchase a robo cleaner in the next few days and I plan on keeping it open year round. We don't have much of a winter here. I'm just trying to educate myself on pools.