Jandy ChemLink ORP/pH Interface simplifies chemistry and chemical balance by giving you constant and accurate pH and chlorine readings. Constant readings avoid chemical highs and lows. ChemLink can also control your salt cell, reducing wear and tear by only activating the cell when it is needed. Adding ChemLink to an iAquaLink equipped system gives you the ability to receive chemical readings and warnings from anywhere. For liquid chemical delivery peristaltic pump (3-310) is available for automated chemical adjustments.