Hi I am newbie I have the 18X52X9 rectangular pool. I didn't read instructions good I thought the saltwater system is all I needed now it seems I need to put cyan uric acid. Can someone explain why? and also how much I put in to my pool? I am not good with Math and parts of this and ppm's of this. Im sorry! How much would I need to put in for my size pool? I live in California where it is HOT! You guys have always been a huge help!