Amazon has the DuPont Universal 15,000-Gallon Water Filtration System on sale for $21.44 with free shipping for Amazon Prime or orders over $25.
Product Features:
- Filters Up To 15,000-Gallon For Home or Office.
- Features Universal 500 Series Poly Block Cartridge
- Standard System has 3/4 in. inlets and outlets.
- 3-Year Limited Warranty.