This bundle focuses on essential components and accessories for maintaining your Express Water WH300 Series Whole House Water Filtration System. It includes the necessary replacement filters for annual changes, along with tools and maintenance items to ensure a successful and leak-free filter replacement process. This collection is ideal for homeowners looking to perform DIY maintenance on their WH300 series system.
Curated by Workshop Notes · Updated June 2026
Built for owners of the WH300 series system who want to handle their own annual maintenance without calling a plumber. This shop focuses on the core 1-year swap-out components and the specific tools needed to open tight canisters.
Curator's pick: Express Water Food Grade Silicone O-Ring Lubricant
Most people skip this, but it is the difference between a tool-free seal and a leaking housing that requires a breaker bar to open next year. Apply it to the O-ring every time to prevent the rubber from binding and flattening over time.
⚠ Worth knowing: These 5-micron filters are great for standard city water but will clog prematurely if your well has heavy, visible silt or sand. If you are cleaning out sediment every few weeks, you need a dedicated spin-down pre-filter before this system to protect these cartridges.
Spin-Down Sediment Pre-Filters for High-Silt Well WaterUnder-Sink Reverse Osmosis Systems for Drinking WaterPEX Tubing and Push-Connect Fittings for Main Line Installation
This shop is built from the Express Water WH300 Series Whole House Water Filtration System, specifically focusing on the essential components and accessories needed for its maintenance. It provides everything required for homeowners to perform DIY filter replacements and ensure their system functions optimally.
This bundle is for homeowners who own an Express Water WH300 Series Whole House Water Filtration System and prefer to handle their annual filter changes and maintenance themselves. It's ideal for those looking to maintain consistent water quality and prolong the life of their filtration system through regular care.
Starting with just the 1-Year Supply replacement filters and a housing wrench provides the core of what you need. A full build, including all recommended maintenance items, will cost between $205 and $340.
Full build
$205–$340
Starter
$130–$180
1-Year Filter Set + Wrench
Best forDIY HomeownersWater Quality MaintenanceExpress Water WH300 OwnersLeak PreventionAnnual Filter Changes
Express Water Whole House Water Filter Replacement Set 1 Year Supply
This filter replacement set provides a one-year supply of cartridges for the Express Water WH300 Series whole house filtration system. It is designed for homeowners who conduct annual maintenance to ensure consistent water quality. Replacing all filters annually helps maintain the system's efficiency and prolong its lifespan.
Complete 1-year replacement filter set
For Express Water WH300 Series systems
Includes sediment, GAC, and carbon block filters
Ensures consistent water filtration
Easy to follow replacement schedule
In this shop: This full replacement set is central to the Express Water WH300 Series Whole House Water Filters vibe, as it provides all the necessary filters for a complete annual system refresh.
This 5-micron sediment filter acts as the first stage in the Express Water WH300 water filtration system. It is suitable for households needing to remove larger particles from their water supply. The filter protects subsequent filters and plumbing from dirt, rust, and sand.
5-micron filtration
Removes sediment, dirt, rust, sand
First stage whole house filter
Standard 10-inch size cartridge
Extends life of finer filters
In this shop: As a critical first stage, this sediment filter fits the Express Water WH300 Series Whole House Water Filters vibe by ensuring basic particulate removal before finer filtration.
The GAC (Granular Activated Carbon) filter serves as the second stage in the Express Water WH300 series, specifically targeting chlorine and unpleasant odors. This filter is beneficial for improving the taste and smell of tap water throughout the house. It addresses common municipal water treatment byproducts.
Granular Activated Carbon (GAC)
Reduces chlorine taste and odor
Second stage whole house filter
Standard 10-inch cartridge
Improves water palatability
In this shop: This GAC filter aligns with the Express Water WH300 Series Whole House Water Filters vibe by significantly improving water aesthetics through effective chlorine and odor removal.
This ACB (Activated Carbon Block) filter functions as the third stage in the Express Water WH300 system, providing final polishing and further chemical reduction. It is designed for users seeking enhanced taste and comprehensive removal of remaining contaminants. The carbon block structure ensures efficient filtration down to specific micron levels.
Activated Carbon Block (ACB)
Final stage filtration
Reduces chemicals and improves taste
Standard 10-inch block design
Polishes drinking water quality
In this shop: The ACB carbon block filter enhances the Express Water WH300 Series Whole House Water Filters vibe by delivering a final stage of purification for superior water taste and clarity.
This specialized wrench is designed to loosen and tighten the large filter canisters of the Express Water WH300 series whole house filter system. It is a necessary tool for anyone performing DIY filter changes. The wrench ensures proper housing seal without overtightening.
Fits Express Water WH300 housings
Durable plastic construction
Facilitates filter changes
Prevents housing damage
Essential maintenance tool
In this shop: This housing wrench is an indispensable tool within the Express Water WH300 Series Whole House Water Filters vibe, simplifying the practical aspect of filter replacement.
This food-grade silicone O-ring lubricant is used to properly seal filter housing O-rings, preventing leaks after filter replacement. It is essential for maintaining the integrity of the water filtration system. Applying lubricant helps to prolong the life of O-rings and ensures a watertight seal.
Food-grade silicone lubricant
Seals whole house filter O-rings
Prevents water leaks
Extends O-ring lifespan
Small tube for multiple uses
In this shop: Crucial for preventing leaks, this O-ring lubricant fits the Express Water WH300 Series Whole House Water Filters vibe by supporting meticulous and effective system maintenance.
These replacement O-rings are designed for the Express Water whole house system filter housings and are often replaced during routine filter maintenance. They are suitable for homeowners who encounter worn or damaged O-rings. Replacing O-rings ensures a secure seal and prevents potential leaks.
Set of replacement O-rings
For Express Water whole house systems
Ensures watertight seal
Durable rubber material
Prevents leaks after service
In this shop: These replacement O-rings are a practical inclusion for the Express Water WH300 Series Whole House Water Filters vibe, addressing a common wear item during filter maintenance.
This bundle ensures a year of clean, filtered water by providing all necessary replacement cartridges for the Express Water WH300 system.
The included tools and lubricants facilitate a smooth and leak-free filter change process, preventing common installation issues.
Performing DIY maintenance with these components can save money on professional service and empower homeowners with system knowledge.
What to know
While comprehensive for maintenance, this bundle does not include the initial Express Water WH300 filtration system itself, only its upkeep parts.
First-time DIYers may find the process of loosening the filter housings and handling O-rings slightly challenging without clear instructions.
How to use this together
1
Prepare Your System
Before beginning, ensure your whole house water supply is turned off and the pressure from the filtration system is relieved by opening a nearby faucet. Have all your replacement filters (Sediment, GAC, ACB), O-rings, lubricant, and the housing wrench ready and laid out in order.
2
Remove Old Filters and Clean Housing
Using the Express Water Whole House Filter Housing Wrench, carefully loosen and remove each filter housing. Dispose of the old filters responsibly. Clean the inside of each housing, ensuring no debris remains, as this can affect the new filter's performance and seal.
3
Replace O-Rings and Lubricate
Inspect the existing O-rings for any cracks or damage; if replacement is needed, use the Express Water Replacement O-Rings for Whole House System. Apply a thin, even coat of Express Water Food Grade Silicone O-Ring Lubricant to each O-ring to ensure a watertight seal and make future changes easier. This step is critical for preventing leaks.
4
Install New Filters and Secure Housings
Insert the new Sediment Filter, followed by the GAC Activated Carbon Filter, and finally the ACB Carbon Block Filter into their respective housings. Hand-tighten each housing firmly, then use the Express Water Whole House Filter Housing Wrench to give each one a final snug turn, being careful not to overtighten and damage the seals or housings.
5
Restore Water Flow and Check for Leaks
Slowly turn the main water supply back on, allowing the system to repressurize. Check each filter housing for any signs of leaks immediately. If any leaks are observed, turn off the water, slightly loosen and retighten the affected housing, ensuring the O-ring is properly seated, then recheck after restoring water flow.
