I finally have my CYA down to 90 from a whopping 160+. Getting ready to make the purchase and would appreciate your recommendations on the size I should get. Right now, it looks like I'll be going with Hayward and getting the SwimPure Plus or Aqua-rite. I believe they are the same systems. Depending on which pool size calculator is used, my gallonage is btw 13,200-14,000. So, let's use the highest number - 14K. Should I go with the 25K model or 40k model? After researching and talking to folks, I've rec'd mixed advice. Some say, "go with the largest you can afford", others say, "go 2x the size but 3x would be overkill" I live in Florida and my pool is in the sun 75% of the time - only used by 2 adults - if any of that makes a difference.