Reverse osmosis (RO) systems are one of the best ways to get high-quality water for drinking and cooking. They remove dissolved salts, other contaminants, and dissolved gases, providing purified water that’s safe for human consumption. But like any water treatment system, RO systems can run into problems over time. If you’re dealing with slow water flow, low water pressure, leaks, or bad-tasting water, you’re in the right place.

At Rare Breed Plumbing, we know how frustrating it can be when your reverse osmosis system isn’t working as it should. That’s why we’ve put together this reverse osmosis troubleshooting guide to help you diagnose and fix the most common issues. Let’s dive in!

1. Low Water Pressure or Slow Water Flow

If your RO system has a low pressure problem, it could be caused by several factors:

Causes:

• Clogged filters: Over time, sediment or carbon filters collect debris and can become blocked, restricting water flow through the system.
• RO membrane issues: If the reverse osmosis membrane is worn out or clogged, it won’t function properly, reducing water production.
• Low supply line pressure: The feed water pressure must be adequate for the system to push water through the membrane. Low pressure can prevent water from flowing efficiently.
• Faulty flow restrictor: The flow restrictor helps regulate wastewater discharge. If it’s clogged, it can restrict water flow and reduce the system’s efficiency.

Fixes:

• Replace filters: Changing clogged filters every 6–12 months ensures proper water flow and filtration.
• Check supply line pressure: Using a pressure gauge, ensure your RO unit has at least 40-60 PSI to function efficiently.
• Inspect the RO membrane: If it’s too old or clogged, replacing it will restore normal water production.
• Clean or replace the flow restrictor: Ensuring proper drainage prevents excessive pressure buildup and improves performance.

2. Leaking Reverse Osmosis System

Water leaks are a common issue with most reverse osmosis systems. They often occur around the filter housing, tank valve, or drain tube.

Causes:

• Loose connections or damaged O-rings: Poorly secured fittings or worn-out O-rings can allow water to escape.
• Cracked filter housing: If the plastic housing holding the filters is cracked, it can cause leaks.
• High tank pressure: If the air chamber inside the storage tank has too much pressure, it can force water out through weak connections.
• Worn-out tubing or blocked drain line: Old tubing can crack, and a clogged drain line can cause water to back up and leak.

Fixes:

• Tighten connections: Ensuring all fittings are secure prevents unnecessary leaks.
• Inspect and replace O-rings: If they’re cracked or worn, replacing them can prevent water from seeping out.
• Check the filter housing: If it’s cracked, replacing it is the only solution to stop leaks.
• Release excess tank pressure: Using a bicycle pump to adjust pressure levels prevents stress on the system.

3. Bad Taste or Odor in Water

If your filtered water has an odd taste or smell, your reverse osmosis system may not be filtering properly.

Causes:

• Clogged filters: When filters become too dirty, they can no longer effectively remove contaminants, allowing bad tastes and odors to pass through.
• Old carbon filter: A worn-out carbon filter can no longer absorb chlorine and other chemicals, leading to off-tasting water.
• Biofilm buildup: Bacteria or mold can grow inside the system, causing unpleasant tastes and odors.
• Faulty RO membrane: If the membrane is compromised, contaminated water can pass through, affecting the water’s taste.

Fixes:

• Replace filters regularly: Keeping filters fresh ensures proper contaminant removal.
• Sanitize the system: Flushing it with a cleaning solution helps eliminate bacteria buildup.
• Check the RO membrane: A faulty membrane should be replaced to restore water purity.

4. RO System Constantly Draining or Not Shutting Off

If your RO unit seems to be constantly draining, you might be wasting water.

Causes:

• Faulty check valve: A broken check valve won’t allow water to stop flowing when the tank is full.
• Malfunctioning air gap faucet: A blocked or improperly installed air gap faucet can cause continuous draining.
• Blocked drain line or drain tube: A clog in the drainage system prevents water from flowing correctly, causing constant discharge.
• Improper tank pressure: If the tank pressure is too low, it won’t signal the system to shut off properly.

Fixes:

• Replace the check valve: This ensures that water stops flowing when the tank is full.
• Clear the drain line: Keeping it free from blockages ensures proper wastewater disposal.
• Adjust tank pressure: Ensuring the right pressure helps the system function correctly.

5. Cloudy or Milky Water from the RO System

Cloudy purified water can be unsettling, but it’s often harmless.

Causes:

• Air bubbles trapped in the water: Tiny air pockets can make water look cloudy but are harmless.
• Newly installed RO system: Air can get trapped in the system after installation, creating a milky appearance.
• High water temperature: Warm water holds dissolved air that releases as bubbles, causing cloudiness.

Fixes:

• Let the system run for a few days: This allows trapped air to clear out.
• Flush the RO system: Draining and refilling the tank multiple times removes excess air.

6. RO Storage Tank Not Filling Up Properly

If your reverse osmosis tank isn’t filling up, it’s a sign something is blocking water flow.

Causes:

• Low feed pressure: If the incoming water pressure is too low, it restricts flow to the tank.
• Clogged pre-filters: Dirty filters slow down water production.
• Faulty tank valve or air chamber: A damaged valve or air chamber affects the tank’s ability to hold water.

Fixes:

• Check feed pressure: A pressure gauge can determine if the supply is adequate.
• Replace clogged filters: Ensuring proper flow helps the tank fill efficiently.
• Test the tank valve: A faulty valve should be replaced to restore proper function.
• Perform a drain flow rate test: This can help diagnose restrictions in the system.

7. No Water Flow from the Faucet

If your RO system isn’t dispensing filtered water, check these factors.

When to Call a Professional Plumber

If your reverse osmosis system continues to have issues despite troubleshooting, it may need professional attention. Persistent leaks, low water flow, or poor water quality can indicate underlying problems requiring expert repair or replacement. Additionally, if your RO unit is over five years old and consistently struggles to produce enough water, it may be time to consider upgrading or replacing components. Our licensed plumbers can diagnose complex system failures, ensure proper installation, and optimize your system’s performance to provide clean, safe drinking water for your home.

Call Rare Breed Plumbing for Any Water Filtration System Repairs

At Rare Breed Plumbing, we specialize in troubleshooting and repairing water filtration systems, including reverse osmosis units. Serving Bountiful, UT, and surrounding areas, including Sandy, Bluffdale, Midvale, Layton, Kaysville, and West Jordan, we provide expert service to keep your drinking water safe and clean.

Whether you need help with low water pressure, replacing filters, or diagnosing a leak, we’ve got you covered. Don’t let water quality issues disrupt your daily routine—give us a call today and let us restore your reverse osmosis system’s efficiency!