Duo Shower Filter Replacement Cartridges Full Set + Extra Filters - NSF Certified Shower Filter, Removes Chlorine, PFAS, & Particulates, Clinically Tested for Healthier Skin & Hair (3+1)
Description
| Item model number | WD-100FC31 |
| Part Number | WD-100FC31 |
| Style | 3+1 |
| Batteries Required? | No |
| Item Weight | 5.6 ounces |
| Batteries Included? | No |
| Manufacturer | Water |
| Package Dimensions | 6.93 x 4.06 x 2.05 inches |
| Included Components | 4 Shower Filter Replacements |
- Welcome to step zero of your self-care routine! Weddell Duo combines proprietary activated carbon and multi-stage condensed layers to effectively remove chlorine, PFAS, particulates, and unpleasant odors from your water. The result? Water that feels and smells cleaner, leaving your skin, scalp, and hair noticeably healthier.
- Why Filtered Water Matters - Unfiltered water can contain harmful contaminants like chlorine, PFAS, and microplastics, which may lead to skin dryness, irritation, and scalp problems. Long-term exposure to these pollutants has been linked to potential health risks, including hormonal disruption and skin conditions. By filtering these out, Weddell Duo ensures you experience cleaner, healthier water for a noticeable difference in your skin, hair, and overall well-being.
- #1 in NSF Certified Performance - Weddell Duo is the #1 NSF Certified Shower Filter for Performance, based on flow rates and capacity among 2024 wall mount shower filters. Weddell Duo is the only shower filter to be NSF certified for reducing Free Available Chlorine while maintaining a verified reduction in PFAS and particulates.
- Easy Installation & Broad Compatibility - Weddell Duo is compatible with various shower heads—rain, fixed, or handheld. Installation is tool-free and quick! Just tighten the swivel connector and reattach your shower head in minutes. It's perfect for homes, dorms, travel, and pets, effectively reducing hair dryness, skin irritation, and unpleasant odors.
- Simple Replacement & Cost-Efficient - Unlike most filters that are hard to replace, Weddell Duo's filters are side-mounted, allowing easy monitoring of their condition. Observe the filtration process through the clear dual cartridges, then twist to remove and replace when needed. Each filter set lasts up to 8,000 gallons, offering a cost-effective solution for long-term clean water.
Product description
We Filter Our Drinking Water — But What About Our Shower Water?
Meet Weddell Duo — The #1 NSF Certified Shower Filter in Performance*
*Based on flow rates and capacity of 2025 wall mount shower filters.
Performance You Can Verify
Chlorine Reduction
Certified by NSF in 2023
Weddell Duo was certified by NSF International to NSF/ANSI 177 and NSF/ANSI 372 standards.
PFAS Reduction
Verified by IAPMO Lab in 2023
Weddell Duo was verified by accredited IAPMO R&T LAB to NSF/ANSI 42 standard.
Particulates Reduction
Verified by IAPMO Lab in 2023
Weddell Duo was verified by accredited IAPMO R&T LAB to NSF/ANSI 53 standard.
Not All Shower Filters Are Created Equal
Real Filters. Real Results.*
*These are actual filters shared by Weddell Water customers — showing the buildup of sediment and contaminants removed from their shower water.
Award-Winning Performance Backed by Experts
Frequently Asked Questions
How often do I need to replace Weddell Duo’s filters? We recommend replacing the full set of Weddell Duo filter cartridges every 5–6 months under standard water conditions for a single user. Actual replacement timing can vary based on the number of people using the shower, your water quality, and household usage patterns.
Why am I experiencing decreased water pressure after installing Weddell Duo? Low pressure is usually caused by one of two reasons:
1) Installation issue: If the Weddell Duo is not properly aligned with your shower arm, if the O-rings are misaligned, or if too much plumber’s tape was used, it can cause leaks or restrict water flow.
2) Filter at capacity: If your filters are full of sediment and contaminants, you may experience lower pressure. Discoloration of the sediment filter along with a drop in water pressure is a sign it’s time to replace them.
Will Weddell Duo soften my water? No. Weddell Duo is a shower filter designed to reduce contaminants such as chlorine, particulates, and PFAS. It does not remove hardness minerals like calcium or magnesium. If you have very hard water, we recommend pairing Weddell Duo with a water softener for the best results.
Why are my filters slowing down before the suggested lifespan? Shorter lifespans are typically due to your water conditions. High sediment, hard water, or heavy contamination can cause filters to reach capacity faster than the average 5–6 months. If you notice both sediment discoloration and a drop in pressure, it’s time to replace them — even if it’s earlier than expected. For these situations, we recommend our 3+1 Replacement Cartridges, which include extra sediment filters to help maintain flow and extend the performance of your unit.
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