Clearwater is one of the oldest manufacturers of Salt Water Chlorinator in the world.  They are manufactured in Australia.  The are now owned by Zodiac Pool Systems.  They manufacture manual Clean systems and self cleaning systems.  They have discontinued the LM2 and LM3 Models, but cells are still available.  Zodiac Also owns Polaris and Jandy.

Salt Levels  -   Manual Clean =  Miniumum 4000 ppm to 5000 ppm                 Self Cleaning = 4000 ppm  to 4500 ppm