This post is very much in favor of the Nature2 cartridge. We have used one for the past 5 seasons. Our pool stays crystal clear and I hardly ever have to shock (every 4-6 weeks). All I have to do is use 2 stingy sticks every 5 days. The main reason for wanting less chemicals is my skin. I have psoriasis and very dry skin. This has helped my skin tremendously. If you start reading about how harmful chlorine is to your skin and how it is absorbed in your body you might decide to take an alternatate route and use less. As long as we have a pool I will gladly spend 100.00 at the beginning of the season. Minimal maintenance and more pool time is wonderful.

Kim