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Flow Restrictors (aka) Flow Controls or Capillaries) are required for all reverse osmosis systems. The Flow Restrictor must be matched in sized to the RO membrane GPD capacity. Flow Restrictors work with the incoming water pressure to power the ASV (auto shut-off valve) and apply the proper pressure throughout the reverse osmosis sytem. Matching the GPD to ml/min (milliliters per minute) flow rate of the flow restrictor will maintain the correct ratio of reject flow (to drain) and permeate (product) flow.It is recommended that you replace the Flow Restrictor each time you replace your reverse osmosis membrane to keep your system operating at peak efficiency. The number on the flow restrictor indicates the flow rate, in milliliters per minute. The flow restrictor should match your reverse osmosis membrane's GPD (gallons per day) production rate. Inline Flow Restrictors Are Recommended - Inline Flow restrictors are very easy to install. They are installed in the 1/4" drain line between the system and the drain saddle. Our inline flow restrictors use quick connectors for simple installation.
The following table gives a guideline for selecting the correct inline flow restrictor for your RO membrane.
The insert style of flow restrictor is a small plastic insert that fits inside of the waste water (brine) outlet on the RO membrane housing or inside of the tube at the connection with the membrane housing. You will need to remove the tube and look inside of the fitting to see the "Insert" if it is in the connector fitting. If it is in the end of the tube, you can see it by removing the tube from the connector.
Learn How To How to Increase the Gallons Per Day (GPD) of your RO System. This will ensure water is available at busy times of the day and also ensure adequate flow to the ice maker. If the ice maker does not have enough flow, it can burn out. The reverse osmosis membrane upgrade is simple on most reverse osmosis systems.
Flow Restrictor - capillary - 250 ml 1/4" quick connect fittings.
Premium inline reverse osmosis membrane flow restrictor - Our in-line capillary flow restrictors are simple to install. Simply push the 1/4" poly tube firmly into the quick connectors and you are done. Be sure that you order the flow restrictor size to match your reverse osmosis membrane size. Arrow on side points toward the drain. Very simple to install.
Flow Restrictor - capillary - 350 ml 1/4" quick connect fittings.
Flow Restrictor - capillary - 500 ml 1/4" quick connect fittings.
Flow Restrictor - capillary - 750 ml 1/4" quick connect fittings.
Flow Restrictor - capillary - 1000 ml 1/4" quick connect fittings.
Flow Restrictor - capillary - 1200 ml 1/4" quick connect fittings.
Hydrotech 50GPD RO Reverse Osmosis System Capillary Flow Restrictor Tube #40600041
Hydrotech 25 GPD RO Reverse Osmosis System Capillary Flow Restrictor Tube #40600040.
RED DRAIN LINE 25 GPD RO, TUBE WITH FLOW RESTRICTOR (1230/1240 SERIES)
Hydrotech 9 GPD RO Reverse Osmosis System Capillary Flow Restrictor Tube #4060003. (1230/1240 SERIES)
Flow Control 25GPD, 101-103, Retrofit
Hydrotech 75GPD RO Reverse Osmosis System Capillary Flow Restrictor Tube #40600042. (1230/1240 SERIES)
SS Inline Flow Restrictor - 450ml FR-121205 with Mesh Screen Cup - #flow-restrictor-ss-450
Stainless Steel Insert Flow Restrictor with Stainless Steel Sediment Screen- 350 ml or 500 ml
Stainless Steel Insert Flow Restrictor with SS Sediment Screen
John Guest ® Poly Tubing 1/4" For Pure Drinking Filter Water Systems
Simply enter your Feed Water TDS and RO Water TDS into the boxes above and click "Submit". The percentage of TDS Rejection will be displayed. We normally recommend membrane replacement once you drop below 75%. This may vary in areas with high TDS in the feed water.
See our selection of TDS meters under Water Tests
Be sure to check our Parts Department for important parts such as TDS Testers For Reverse Osmosis Membranes, Replacement Tanks, O-rings , Filter Housing Wrenches, Faucets, Pumps, Fittings, UV Systems and more parts for your reverse osmosis pure water filtration system. View maintenance and servicing tips online at our Installation & Trouble shooting Guide.