WECO Whole House Backwash Filter/Softener with EcoMix Advanced Softener Media and Big Blue Sediment Pre-Filter for the Reduction of Hardness, Iron, Manganese and Tannins (16" x 65" - 46,000 Grains) - -
Automatic Backwash Filter
Should I Use a Non-Backwashing Upflow Calcite Neutralizer or a Backwashing Downflow?
How a Backwashing Filter Works - West Carolina Water Treatment
filters backwashed with air and water simultaneously - Degremont®