Envig CarShine 817 Deionized Spotless Car Wash System with Bypass Valve & Inline TDS Meter

Great value It includes everything you don't even know to ask for! There's a flow regulator so the wster has enough time to interact with the media, a bypass to extend the media's lifespan and a PPM to let you know when irs time to chg the media! Pro tip; don't let the media dry out or it stops working; "close" both ends when not using to keep it wet.