W222091 LM-2 Series Power PC BoardThe Zodiac Clearwater LM is fully automatic so you can set the chlorine level and forget it. The unit will automatically keep your pool chlorinated at the desired setting. The LM also reverses polarity which cleans the units electrodes, virtually eliminating any calcium build-up on the cell. The system is made with clear housing for easy inspection, and touch panel controls with a memory feature that make setting it easy.The LM also has a unique super-chlorination feature, which can be activated at the touch of a button. This mode automatically boosts chlorine levels after periods of heavy usage or hot weather. We offer the LM in two sizes to accommodate most pools. It is backed with a 3-Year Warranty on the cell and a 1-Year Parts and Labor Warranty on the entire unit.