My RO System has little water pressure - why?

Your RO system likely has a clogged filter, a fouled membrane, or low pressure in the storage tank. These are the most common causes of slow flow and low pressure.

Here’s a breakdown of what might be going wrong and how to fix it:

Common Causes of Low Pressure in RO Systems

• Clogged Pre-Filters or RO Membrane
  • Sediment, carbon, and the RO membrane can become clogged over time.
  • If not replaced regularly (typically every 6–12 months for filters, 24 months for membrane), water flow slows dramatically.
• Low Air Pressure in the Storage Tank
  • The tank should have 7–8 psi when empty. If the pressure is too low, water won’t flow properly.
  • You can check this with a tire pressure gauge and re-pressurize using a bike pump.
• Ruptured Tank Bladder
  • If you get a short burst of water followed by a trickle, the internal bladder may be damaged.
  • This requires replacing the tank.
• Low Incoming Water Pressure
  • RO systems need at least 40 psi to function well. If your home’s water pressure is low, the system won’t perform properly.
• Clogged Flow Restrictor or Check Valve
  • These small components regulate water flow and can become blocked.
  • Cleaning or replacing them may restore normal pressure.
• Kinked Tubing or Improper Installation
  • Check for pinched or bent tubing that could restrict flow.

What You Can Do

1. Replace filters and membrane if they’re overdue.
2. Check tank pressure with a gauge and re-pressurize if needed.
3. Inspect tubing and fittings for blockages or damage.
4. Flush the system after replacing components to remove trapped air.

If you’ve done all this and the issue persists, it might be time to consult a technician or consider replacing the tank or membrane.