Clearwater is manufactured by Zodiac in Australia.   Clearwater was started in Australia in the 1970's and was purchased by Zodiac. 

They have manual clean and self Cleaning systems.  The LM2 models were discontinued in 2006 and replaced by the LM3 Series. 

Salt levels - Manual Clean 4000 to 5000 ppm

                 Self Cleaning  4000 to 5000 ppm