We have a 14x42 Intex Ultra Frame Pool, bought the saltwater system. Thought we'd be good, but saw a post from a guy that had the same set up and his water is green immediately. Do we need a skimmer? I thought the saltwater system would be easier. How often will we need to test, or if it's clear, does that mean it's good? I know I sound really ignorant, just didn't know it would be complicated.