I'm so clueless with all this pool stuff . I want to have everything that I need when we set up our 15x48 intex metal frame pool with the salt water system. I would like to make the pool as easy and low maintenance as possiable. Would the Intex 1600 gallon sand filter be good for my pool or would a bigger one be better? Walmart has it on sale for $149.00. If in the future we get a bigger pool would this filter be able to handle a 18x48 or 18x52? Thanks again!!