Global Household Water Softener System Market Size, Share, and Trends Analysis Report, By Product Type (Salt-Based Ion Exchange Softener, and Salt-Free Water Softener), By Flow Rate (Up to 30 GPM, 30 to 60 GPM, 60 to 90 GPM, and Above 90 GPM), By Sales Channel (Hypermarket/Supermarket, Specialty Stores, Online, and Others), Forecast (2022-2028)