The Flow-Pur RV-PRO 10, 000 Portable Water Softener provides clean, soft water for up to 20 days for only pennies a week. It has a compact design for easy storage, portability, and functionality. And for ultimate value, the Flow-Pur RV-PRO 10, 000 is specially engineered for low-cost operation and high-quality performance. Features and Benefits: Double-hose shut-off valve eliminates need to manually switch inlet/outlet hoses for regeneration. Built-in drain line flow restrictor increases capacity up to 55% for more effective regeneration â less than 40 minutes. Engineered for high flow rates â up to 4 GPM with low pressure drop. Includes hardness test strips for checking softness and quality of water Softens water & removes calcium, magnesium, & trace amounts of iron to increase quality Prevents hard water stains & helps preserve useful of appliances & fixtures Uses common table salt, softening up to 1, 000 gal. of water at 10 grains of hardness per cycle | Flowmatic Flow-Pur RV-PRO 10,000 Portable Water Softener