Pentek Whole-House Iron Reduction Cartridge 20" Big Blue RFFE20-BB — Removes Dissolved Iron up to 3 ppm, Chemical-Free

If you have iron-bearing well water or see orange/brown staining on fixtures, this 20" Pentek radial flow iron reduction cartridge is designed to be fitted inside standard 20-inch Big Blue housings to target dissolved iron and the metallic taste it produces. It works without adding chemicals, installs on the main cold-water line after a pressure tank or meter, and is recommended to be used alongside a sediment pre-filter and a carbon post-filter for best overall water quality.

How does this cartridge improve water taste and appearance?

The RFFE20-BB reduces dissolved iron that causes metallic taste and discolored water, helping water look and taste fresher at every tap. By lowering dissolved iron, it also decreases the orange and brown staining commonly left on sinks, tubs, and fixtures.

• Removes up to 3 ppm of dissolved iron that causes metallic flavor.
• Lowers visible rust-colored staining on plumbing fixtures and appliances.
• Works without adding chemicals, so treated water stays potable.

What size housing and plumbing locations are compatible with the RFFE20-BB?

This cartridge is built for 20" Big Blue housings and fits heavy-duty housings from Pentair Pentek and many other manufacturers that accept 20" x 4.5" elements. Install it on the main cold-water line immediately after your pressure tank or water meter to treat water entering the home.

• Cartridge dimensions: 20" x 4.5", designed for 20-inch Big Blue housings.
• Mounts on main cold-water feed, after pressure tank or meter.
• Compatible with common whole-house plumbing layouts and housings.

How often will I need to replace the cartridges and what affects lifespan?

At approximately 3 ppm dissolved iron, a family of four will typically get about three months per cartridge; this two-pack therefore covers about six months under those conditions. Higher iron levels, increased flow, heavy sediment, or visible return of staining and metallic taste indicate earlier replacement is needed.

• Typical runtime: roughly 3 months per cartridge at 3 ppm iron for a four-person household.
• Replace sooner with higher iron, heavy sediment, or reduced flow.
• Pairing with a sediment pre-filter extends cartridge life and performance.

How should I stage filters for best overall results?

To protect the iron reduction cartridge and maximize performance, use a sediment pre-filter ahead of the RFFE20-BB to remove particles, and a carbon post-filter downstream to polish taste and odors. This three-stage arrangement addresses sediment, dissolved iron, and residual organics for comprehensive whole-house treatment.

• Sediment pre-filter: captures sand, silt, and larger particles to protect the media.
• Pentek RFFE20-BB: targets dissolved iron and metallic taste without chemicals.
• Carbon post-filter: improves taste and removes residual odors after iron reduction.

Who is this for: homeowners with well water or municipal supplies showing dissolved iron and metallic taste who want a chemical-free, whole-house solution that fits standard 20" Big Blue housings. It suits families seeking to reduce staining on fixtures and prolong the life of plumbing and appliances; pair it with sediment and carbon filters for best maintenance intervals and water quality. Replace the cartridge sooner in higher-iron systems and protect the unit from freezing during winter.