De-ionizer Water Filtration SystemCertain dissolved impurities in standard tap water will corrode the inside of the battery and decrease your battery life and performance. With a Deionizer Watering Kit, you can easily and inexpensively remove these harmful impurities. This Deionizer Kit purifies water prior to going into the battery. This helps to keep the battery in peak operating condition and can extend battery life. In fact, depending on the supply water quality, one cartridge can