1. Product Overview
The iSpring WGB32B-MKS is a 3-stage whole house water filtration system designed to provide clean, filtered water throughout your home. This system effectively reduces a wide range of contaminants while preserving beneficial minerals in your water.
Key Filtration Capabilities:
- Stage 1 (FP25B Polypropylene Sediment Filter): Captures sediment particles down to 5 microns, including dirt, sand, and rust.
- Stage 2 (FG25B-KS Compound Filter): Targets chlorine, chloramine, lead, mercury, hydrogen sulfide, and other heavy metals.
- Stage 3 (FM25B Iron Water Filter): Specifically designed to reduce iron levels up to 3.0 ppm and manganese up to 1.0 ppm.
This system ensures a robust water flow of up to 15 GPM with minimal pressure drop, suitable for a family of four for up to a year, depending on water quality and usage.

Image: iSpring WGB32B-MKS 3-Stage Whole House Water Filter System with three blue filter housings and three replacement cartridges.
2. Safety Information
- Always turn off the main water supply and depressurize the system before performing any maintenance or filter changes.
- Follow all local plumbing codes and regulations during installation.
- Ensure all filter cartridges are individually unwrapped before installation for optimal performance.
- If you are unsure about any installation steps, consult a qualified plumber.
3. What's in the Box
Your iSpring WGB32B-MKS system package includes the following components:
- Water Filter System (pre-assembled manifold and bracket)
- Three Filter Cartridges (FP25B, FG25B-KS, FM25B)
- Housing Wrench
- Instruction Manual
- Braided Stainless Steel Hoses
- Push-Fit Hose Connectors
- Plumber's Tape

Image: Components included in the iSpring WGB32B-MKS package.
4. Setup and Installation
The iSpring WGB32B-MKS system is designed for straightforward DIY installation. Refer to the detailed user manual for complete step-by-step instructions. Below are key considerations and a helpful video guide.
4.1. Flow Direction
These systems require a specific water flow direction for optimal filtration. When facing the system, the inlet is typically on your right and the outlet on your left, ensuring water flows from right to left through the filter stages. If your plumbing setup requires the opposite flow, the housing can be reversed.
Correcting Flow Direction:
- Place the machine head on a flat surface.
- Each housing cap is secured by four screws to a metal bracket. For a 3-stage system, there are 12 screws.
- Remove all screws.
- Flip and carefully realign the metal bracket with the housing caps to reverse the inlet/outlet orientation.
- Tighten all screws back into position.
Video: Guide on correcting the water flow direction for iSpring WGB and WCB Series Whole House Water Filtration Systems.
4.2. Plumbing Connections
- The system features 1" NPT inlet/outlet connections.
- It is recommended to install bypass piping with at least one shut-off valve to allow for maintenance without interrupting the main water supply.
- Apply plumber's tape (included) to all threaded fittings to ensure a watertight seal.
- Lightly coat the housing O-rings with plumber's silicone grease before installation to prevent leaks.
4.3. Initial Flush
After installation, slowly open the main water supply to fill the system. Once filled, allow water to run through the system for approximately 15 minutes to flush out any carbon fines or air. The water may appear cloudy for a day or so initially, which is normal.

For further assistance, consult the comprehensive user manual or contact iSpring customer support.
8. Specifications
| Feature | Specification |
|---|---|
| Model Name | Whole House Water Filter System |
| Item Model Number | WGB32B-MKS |
| Product Dimensions | 24.5"L x 8"W x 28"H |
| Weight | 56 Pounds |
| Maximum Flow Rate | 15 Gallons Per Minute |
| UPC | 810004175068 |
| Manufacturer | iSpring Water Systems |
| Special Feature | Heavy Duty |
9. Warranty & Support
iSpring Water Systems is committed to providing exceptional customer support. For any technical assistance, warranty inquiries, or post-purchase support, please contact our dedicated team.
- Contact: Technical assistance and service are available directly from our Atlanta, GA headquarters.
- Methods: Support can be reached via phone or email. Refer to your product packaging or the official iSpring website for current contact details.







