Our flagship model DIC-20 provides approximately 300 gallons of mineral-free, de-ionized water based on your water input quality. It consists of two 20 inch de-ionization housings that feature replaceable (or refillable) cartridges that simply slide into the watertight tubes. The entire unit is mounted on a powder coated, rust resistant rolling cart that makes it convenient to move into position and store away when finished. The advantage of using this system is that you can rinse your vehicle and walk away without having to worry about water spotting - no drying towels required!