One of the advertised "positives" of the Nature 2 system is that you don't need to run as high Cl levels as you do in a regular chlorine pool. However, I agree with Bleach=Chlorine in that you need to read through the posts on Nature 2 elsewhere in this forum and decide if you really want to continue using it. Basically the Nature 2 relies on copper and other minerals (is it silver, or zinc?) to act as an algaecide. However, while it may kill algae, it does NOT kill viruses or bacteria. The other thing about the Nature 2 (my understanding from reading posts here and literature on it, I do not have personal experience with it myself) is that the water is "sanitized" while it's in the unit, but once it leaves the unit and goes back into the pool, it's fair game for whatever wants to grow in it--hence the requirement for chlorine in the pool itself. Most people here have decided that if you need the chlorine anyway, AND chlorine does a much better job of keeping your water clean, why bother with the expense of the Nature 2 system? Add into that the fact that when the Nature 2 adds copper to your water, then when you shock the pool the copper (at high levels) will usually precipitate out of the water and into your pool in the form of stains.....so then you have to add metal sequestrants.

Take some time, and do some reading...but for now, Cl of 8 is just fine. Don't let it drop below 3.

Janet