RO Flow Restrictor (FR)
Calibrated 450 CC Flow Restrictor: The Unsung Guardian of RO Pressure
Maintains optimal back-pressure across the membrane while flushing away concentrated reject salts
Inclusive of 18% GST • Free standard delivery on orders above ₹499
How It Works Inside Your Water Purifier
Role in the Purification Chain
A tiny, inexpensive plastic valve installed on the drain pipe that holds enormous responsibility. It creates calibrated back-pressure inside the membrane housing, forcing pure water through the 0.0001-micron pores while permitting waste salts to discharge.
Physical & Mechanical Principle
A laser-calibrated precision micro-orifice restricts wastewater discharge to exactly 450 ml/minute under 70–80 PSI pump pressure. This maintains the essential 1:3 recovery-to-reject fluid balance required for membrane longevity.
Technical Specifications & Dimensions
How to Spot Genuine vs Local Copies
The Clogged FR Trap That Ruptures Membranes
Over time, calcium crystals choke the tiny FR orifice. With the drain blocked, pump pressure spikes past 150 PSI, rupturing the membrane. Technicians replace the expensive membrane but leave the clogged ₹40 FR in place, ruining the new membrane in weeks.
Always replace the Flow Restrictor whenever you install a new RO membrane. It costs under ₹40 and is the cheapest insurance for your machine.
5-Minute Step-by-Step DIY Installation
Locate FR on Drain Line
Find the small cylindrical valve on the pipe heading to your kitchen sink drain.
Observe Flow Arrow
Notice the arrow on the old valve pointing towards the wastewater drain.
Push Collar & Release
Press the collar ring on both ends and withdraw the 1/4" tubes.
Insert New FR
Push tubes 15mm into the new FR 450, ensuring arrow points towards the drain.
Watch Video Demonstration
The ₹40 Part That Saves a ₹2,000 RO Membrane
Learn how the flow restrictor works, how to test if it's clogged, and why changing it saves your purifier.
Universal Purifier Compatibility
Standard 1/4" push-fit ports and certified dimensions guarantee full plug-and-play compatibility with all popular water purifier brands sold in India:
Frequently Asked Questions
What happens if the Flow Restrictor is clogged?
Waste water stops flowing, internal pressure spikes, the booster pump groans loudly, and the membrane ruptures under excessive back-pressure.
Can I use an FR 450 with a 75 GPD membrane?
Yes, FR 450 is the optimal standard calibration for 75 GPD and 80 GPD domestic membranes in Indian water conditions.