VEVOR RV Water Softener, 16,000 Grain Portable Water Softener, with 3/4" Brass Fittings and 42" Hose, Soften Hard Water Filter System for RVs, Trailers, Boats, Mobile Car Washing, Pressure WashingProduct Features Higher Adsorption Elevate your water quality with our RV water softener, with an absorption capacity of up to 16,000 grains. The portable water softener swiftly captures heavy metals found in hard water, reducing hardness levels to 0 3 grains per gallon (gpg). Experience the benefits of clean, healthy water! (Under a hardness level of 6. 5 gpg, regenerates 2,461 gallons of soft water, providing sustained use for up to 50 days.)