Flow Restr, 150gpd Blk In Wht Gst Ftg

This Watts (TST Water) Flow Restrictor is rated at 150 GPD and comes as a black insert housed in a white John Guest-style quick-connect fitting, designed for residential reverse osmosis systems. The flow restrictor is a small but essential component that controls how much water flows to the drain from the RO membrane, setting the all-important ratio between treated permeate water and reject (concentrate) water.

How It Tunes Your RO System

A reverse osmosis membrane needs the right amount of cross-flow sweeping across its surface and out to the drain in order to flush away the contaminants it rejects, which keeps the membrane clean and protects it from premature fouling. The flow restrictor establishes that drain rate, and it must be carefully matched to the membrane's production rating. A 150 GPD restrictor is intended to pair with membranes in that production range, maintaining the proper recovery ratio so the system produces clean water efficiently while keeping the membrane swept clear. Too little drain flow lets contaminants concentrate and foul the membrane quickly; too much wastes water and lowers overall efficiency.

• TST Water (Watts) flow restrictor, 150 GPD rating
• Black restrictor insert in a white John Guest-style fitting
• Quick-connect design for tool-free installation
• Sets the drain (reject) flow ratio for the RO membrane
• Matches membranes rated near 150 gallons per day
• Compact in-line component for residential RO systems

The integrated John Guest-style quick-connect fitting makes installation simple on standard RO tubing; you press the tubing in for a secure, leak-resistant connection without tools. This is a common service item, since flow restrictors can become clogged or out of spec over time, and it is also the part to update whenever you change your membrane. If you replace your RO membrane with one of a different production rating, the flow restrictor should be matched to the new membrane accordingly, otherwise the recovery ratio will be off and performance will suffer. Before installing, confirm that the 150 GPD rating suits your membrane, depressurize the system, and orient the restrictor correctly in the drain line according to the indicated flow direction so it functions as intended.