Here at Isopure Water, we're often asked about maintaining and cleaning a water filtration system under the sink. Proper care not only ensures consistently pure and fresh-tasting water, but it also extends the life of your filtration system. In this guide, we'll walk you step-by-step through cleaning and maintaining your under-sink water filter, ensuring your family enjoys the highest quality water every day.


Why Regular Maintenance of Your Under Sink Filtration System is Essential

An under-sink water filtration system is one of the most convenient ways to get pure water straight from your kitchen tap. But like any appliance, regular maintenance and cleaning are critical. Over time, contaminants build up, filters clog, and bacteria can form—impacting your system's efficiency and the quality of your drinking water.

Proper maintenance helps:
  • Maintain optimal water flow.
  • Ensure the removal of harmful contaminants.
  • Extend your system’s lifespan.
  • Protect your investment.


How Often Should You Clean Your Under Sink Filtration System?

We recommend inspecting your under-sink filtration system every 3 to 6 months. Typically, filters should be replaced every 6-12 months, but your system's specific guidelines will indicate the exact replacement interval.


Tools You’ll Need for Cleaning and Maintenance:

  • Replacement filters or cartridges (specific to your system)
  • Bucket or container
  • Clean cloth or sponge
  • Mild soap or disinfectant wipes
  • Adjustable wrench
  • Food-grade silicone lubricant (optional, but recommended)


Step-by-Step Guide to Cleaning and Maintaining Your Under Sink Filtration System

Step 1: Shut Off the Water Supply

  • Before cleaning, shut off the cold water supply valve beneath the sink to avoid leaks and water spills.


Step 2: Relieve Pressure and Remove Filters

  • Open the dedicated filtered water faucet to relieve pressure and drain remaining water.
  • Carefully unscrew filter housings and remove old cartridges.


Step 3: Clean the Filter Housings

  • Rinse filter housings thoroughly with warm water. Use mild soap and a sponge or disinfectant wipes to remove dirt, debris, or biofilm.
  • Inspect housings and O-rings for cracks, damage, or wear.


Step 4: Check and Replace O-Rings (If Needed)

  • Inspect O-rings closely for cracks, brittleness, or damage.
  • Apply a small amount of food-grade silicone lubricant to keep O-rings flexible and provide a better seal.
  • Replace O-rings if damaged or excessively worn.


Step 5: Install New Filter Cartridges

  • Insert new cartridges into the cleaned housings. Ensure cartridges are correctly positioned according to your system’s guidelines.
  • Screw housings back in place securely, but avoid overtightening.


Step 6: Turn On the Water and Check for Leaks

  • Gradually reopen the cold water supply valve.
  • Check all connections carefully for leaks. Tighten fittings as necessary.


Step 7: Flush the System

  • Open your filtered water faucet and let the water run for at least 10 minutes to flush out air and any loose particles from new cartridges.


Helpful Maintenance Tips from Isopure Water

Here are a few extra tips to keep your water filtration system under the sink in top shape:
  • Mark your calendar: Setting reminders ensures timely filter replacements and regular inspections.
  • Keep spare filters on hand: Maintaining extra replacement cartridges makes routine changes quicker and easier.
  • Consider a maintenance log: Track filter changes and maintenance activities for better long-term care and troubleshooting.


Recommended Under Sink Filtration Systems

If you are considering upgrading or replacing your current system, here are two top-rated systems we highly recommend:


Keeping Your Water Clean and Safe

Properly maintaining your under-sink filtration system ensures your family continues to enjoy pure, clean water free of contaminants. Following the simple steps outlined above will help you keep your system operating efficiently for years to come.

If you have questions about maintaining your current under-sink water filtration system or need help selecting the right replacement filters, don’t hesitate to contact us at Isopure Water. We're always happy to help!