Description Aquatic Life Deionized Spot-Free Car Rinse Unit - Premium Water Deionizer for Car Washing - Spotless Car, RV, and Motorcycle Wash System. The reason you see unsightly water spots left behind after washing is from TDS (total dissolved solids) in water. If youâre looking for a quick, effective way to wash your car and avoid hard water stains, then youâll love this inline spot free rinse system. TDS in water can vary greatly depending on the water quality in your area. To achieve a flawless, spot free shine, you need to filter out TDS from your water. Thatâs where this DI car washing unit comes in handy. The refillable cartridges are filled with a resin thatâs charged with Cation and Anion resins. These resins filter and absorb TDS and minerals, so youâre left with clean water thatâll deliver a professional-quality car wash. Even better, when youâre finished rinsing your car, truck, RV, or motorcycle, you can let it air dry. Youâll never need to towel dry when you use this rinse system. Item #540565, UPC #810957015657 A reasonably priced deionized resin spot-free car rinse system with brass fittings! Product Features: ⤠Dual DI Unit Housing with Mounting Bracket ⤠Plumberâs Pipe Tape ⤠(2) Color-changing Refillable Deionization Cartridges ⤠Canister Wrench ⤠Brass ½" MPT x Female Garden Hose Adapter ⤠(2) Brass ½" MPT x Male Garden Hose Adapter ⤠0.75 Gallon Per Minute Flow Regulator ⤠Installation, Operation and Maintenance Guide Item 540565. Download the Spot-Free Rinse Unit Manual  HERE Download the Spray Nozzle Compatibility Chart HERE   Specifications Suggested water pressure: 65 PSI ⢠Maximum water pressure: 80 PSI - Optimal Water Temperature: 77°F (25°C). Video Video