How To Install a Whole House Water Filter

Installing a whole-house water filter addresses water issues at the source, ensuring every faucet in your house delivers cleaner, better-tasting water. In the above video, This Old House plumbing and heating expert Richard Trethewey demonstrates how to install a whole-house water filtration system, highlighting its benefits and explaining the maintenance requirements.

Benefits of Whole-House Water Filtration

Whole-house water filters treat water as it enters your home, providing filtered water to every tap and appliance. These systems typically consist of two main components: a prefilter to remove sediment and larger particles and a carbon filter to improve taste and odor.

Installing a whole-house water filter offers several advantages:

• Improved water taste and odor throughout the entire home
• Reduced sediment and contaminants that can damage plumbing fixtures and appliances
• Filtered water from every tap without the need for individual faucet filters

Types of Whole-House Water Filters

There are a few types of whole-house water filters available, each designed to address specific water quality issues:

• Carbon filters: Reduce chlorine and improve taste and odor
• Reverse osmosis systems: Remove a range of contaminants, including dissolved solids
• Sediment filters: Remove particles such as sand, dirt, and rust
• UV purification systems: Disinfect water by killing bacteria and viruses

Evaluating Water Quality Before Filter Installation

Before deciding to install a whole-house water filter, evaluate your current water quality. Understanding the specific contaminants and issues can help you choose the right type of filter for your needs.

Professional water testing services can provide a detailed analysis of your water’s chemical composition. Many companies offer comprehensive test kits that you can use yourself. Look for tests that measure:

• Bacterial contamination
• Chlorine content
• pH levels
• Presence of heavy metals

Municipal water suppliers often provide annual water quality reports. Reviewing these can give you an idea of the typical contaminants in your area and help you make an informed decision.

Tools and Materials Needed to Install a Water Heater

Gather the following tools and materials:

• Bypass valve
• Copper pipe and fittings (as needed)
• Fitting brush
• Mounting brackets and screws
• Pipe wrenches
• Propane torch
• Shut-off valves
• Solder and flux
• Teflon tape
• Tubing cutter
• Whole-house water filter system

Water Filter Installation Process

First, pick an appropriate location for your filter. Here are our recommendations:

• Near the main water supply line entering your home
• In an easily accessible area for maintenance
• Protected from freezing temperatures
• With enough clearance for filter changes

Now, follow the steps below for installation.

Step 1: Shut Off Water Supply

Turn off the main water supply to your house and drain the pipes by opening all faucets and fixtures. Open a drawoff valve near the main to release any remaining water pressure.

Step 2: Mount the Filter Housing

Determine the location for the prefilter and carbon filter. If necessary, attach a piece of plywood to the wall for mounting the filter brackets. Secure the brackets according to the manufacturer’s instructions.

Step 3: Cut into the Main Water Line

Using a tubing cutter, carefully cut into the main water supply pipe where you plan to install the filter system. Ensure the cut is clean and straight.

Step 4: Install Adapter Fittings

Clean the pipe ends and solder adapter fittings to transition from the copper pipe to the filter housing. It’s important to do this on a workbench away from the filter to avoid heat damage. Once cool, connect the adapter fittings to the filter housing using thread sealing tape on threaded connections.

Step 5: Connect the Filter System

Install the prefilter and carbon filter housings according to the manufacturer’s instructions. Connect the filters to the main water line using appropriate fittings and valves. Include a bypass valve to allow water to flow to the house when servicing the filters.

Step 6: Install Shut-Off Valves

Install shut-off valves before and after the filter system. These valves allow you to isolate the filters for maintenance without shutting off water to the entire house.

Step 7: Test the System

Once all connections are secure, slowly turn the water supply back on and check for leaks. Open faucets throughout the house to release air from the pipes and allow water to flow through the new filter system.

Water Filter Maintenance and Upkeep

Regular maintenance keeps your whole-house water filter system in good working order, protecting your investment. Follow the manufacturer’s recommendations for filter replacement:

• Prefilter: Typically every 3–6 months, depending on water quality
• Carbon filter: Usually every 6–12 months or when you notice a change in water taste or odor

Check pressure gauges regularly to determine if filters need replacement sooner. Periodically inspect your whole-house water filter system:

• Check for leaks around connections and fittings.
• Ensure bypass and shut-off valves are functioning properly.
• Clean the filter housings during filter changes to prevent buildup.

Additional Tips for an Efficient Installation

When installing a whole-house water filter, we suggest the following tips to ensure an effective setup.

Use Quality Materials

Choose high-quality pipes, fittings, and tools to ensure a durable and leak-free installation. Investing in quality materials can save you time and money on repairs in the long run.

Follow Manufacturer’s Instructions

Each water filter system may have specific installation and maintenance instructions. Always follow the guidelines provided by the manufacturer to avoid voiding warranties and ensure optimal performance.

Label Valves and Filters

Labeling the shut-off valves and filters can make maintenance easier, especially if you have multiple components in your filtration system. This can also help during emergencies when you need to quickly isolate the system.

Keep Spare Filters on Hand

Having spare filters readily available can prevent downtime when it’s time for maintenance. This ensures that your water quality remains consistent without interruptions.