Installing an under-sink water filter is an increasingly popular solution for enjoying healthier, more pleasant drinking water that’s better suited to cooking. Whether it’s to reduce chlorine taste, impurities, limescale or heavy metals, this discreet and effective system offers you continuous filtration right at the tap. As experienced plumbers, we offer you a complete guide to the operation, installation and maintenance of an under-sink filter.
Why install an under-sink water filter?
Unlike carafes or bottles, an under-sink filter treats water continuously from the moment it reaches the tap. It improves water quality for :
- Drinking, cooking, washing fruit and vegetables
- Reduce traces of limescale in your appliances
- Prevent impurities from building up in your pipes
- Protect your health, especially if you are sensitive to nitrates, heavy metals or chemical residues
It’s a solution that’s discreet, effective and economical in the long term.
What type of filter should I choose?
There are several types of under-sink water filters to choose from, depending on the quality of your water and your objectives:
- Activated carbon filter: ideal for eliminating chlorine taste, pesticides, organic residues and certain chemical contaminants.
- Sediment filter: useful for retaining particles, sand, rust, sludge or solid impurities.
- Double or triple filtration system: combines several cartridges for a more complete action.
- Reverse osmosis filtration: highly efficient, but requires more complex installation and regular maintenance.
Steps for installing an under-sink water filter
Installing a water filter requires a minimum of plumbing know-how. Here are the main steps to follow:
1. Turn off water supply
Turn off the cold water supply under the sink before starting any work. Open the tap to release any residual pressure.
2. Identify connection point
Most filters are installed between the cold water inlet and the kitchen faucet. Some models require the addition of a secondary tap dedicated to filtered water.
3. Install filter support
Fix the filter support to the bottom of the under-sink unit, close to the water inlet, leaving enough space to replace the cartridges.
4. Connect filter
Using the flexible hoses supplied, connect the water inlet hose to the filter, then the filter to the tap or secondary tap. Tighten connections to prevent leaks.
5. Check for leaks and purge filter
Turn on the water supply and let it run for a few minutes to remove any air and dust from the new cartridges. Check for leaks.
Cartridge maintenance and replacement
Good maintenance is essential to guarantee the filter’s efficiency. In general, cartridges should be replaced:
- Every 6 months to 1 year for activated carbon filters
- Every 3 to 6 months for sediment filters
- According to manufacturer’s recommendations for more complex systems
Note that a clogged filter can reduce water pressure or lose efficiency, hence the importance of following a maintenance schedule.
Do I need a plumber?
If you’ve never handled an under-sink installation before, or if you want a discreet, reliable and compliant installation, it’s best to call in a professional plumber. He will make sure :
- Choosing the right filter for your water
- A leak-free connection
- A clean, long-lasting installation
- Optimum hose routing without risk of pinching
Conclusion: healthier water at your fingertips
Installing an under-sink water filter is an excellent choice for improving the quality of your water every day. Easy to use, discreet and economical, it eliminates the need to buy bottles and protects both your health and your equipment. Whether you want to drink purer water or extend the life of your appliances, under-sink filtration is a sustainable solution.
Need help choosing or installing your filter? Discover our complete plumbing service or contact us directly here.
