Isopure Water (ISO-WH3-20B) Triple Stage 20" Big Blue Boy Whole House Filter
Triple Stage 20" Big Blue Boy Whole House Filter
Most whole house filters use undersized 10" x 2.5" cartridges that choke flow in larger homes. The ISO-WH3-20B uses oversized 20" Big Blue housings with 1" ports to handle high demand without dropping pressure. Fully assembled and pre-loaded with three stages of filtration, it's ideal for homes, offices, or properties where backwashing systems aren't practical.
Three-Stage Filtration Process
5 Micron Sediment Pre-Filter
Captures sand, silt, rust, and particulate down to 5 microns. Protects downstream carbon stages from fouling and extends their service life.
Replace every 6–12 months10 Micron Carbon Block Filter
Reduces chlorine, chloramines, THMs, VOCs, pesticides, herbicides, MTBEs, and chemical tastes. Effective adsorption across the entire 20,000-gallon rated capacity.
Rated for 20,000 gallonsFinal Polish Stage
Additional carbon or sediment filtration to ensure clean, clear water at every faucet and showerhead. Removes residual turbidity, taste, and odor compounds that can slip through single-stage systems.
Technical Details
| Model Number | ISO-WH3-20B |
| Cartridge Size | 20" x 4.5" (Big Blue) |
| Port Size | 1" NPT inlet/outlet |
| Maximum Flow Rate | 40 GPM |
| Recommended Flow Rate | 4 GPM continuous |
| Operating Pressure | 100 PSI maximum |
| Operating Temperature | 40–100°F |
| Dimensions | 28" H x 15" W x 8" D |
| Includes | Filter wrench, metal wall bracket, installation instructions |
| Warranty | 2-year limited manufacturer, 30-day money-back guarantee |
Best Used For
The ISO-WH3-20B is designed for homes and offices with municipal or well water that need high flow rates without sacrificing filtration quality. It fits in spaces where backwashing filters aren't practical due to drainage or electrical limitations. The 1" ports and 20" Big Blue housings ensure minimal pressure drop even during peak demand. Works with any standard 20" x 4.5" replacement cartridges, giving you flexibility to customize filtration media as water conditions change.
