FR-420 Flow Restrictor for 75 GPD RO Membranes
  • FR-420 Flow Restrictor for 75 GPD RO Membranes

FR-420 flow restrictor

FLOW420 5905031170119
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FR-420 restrictor (flow limiter) for reverse osmosis systems, mounted on the wastewater outlet. Connected via quick couplings. It enforces the correct flow of rinse water through the membrane, which helps remove accumulated contaminants and supports the membrane's lifespan. Recommended replacement every few years and each time the membrane is replaced. Designed for 75 GPD membranes.

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FR-420 flow restrictor

FR-420 flow restrictor

FR-420 restrictor (flow limiter) for reverse osmosis systems, mounted on the wastewater outlet. Connected via quick couplings. It enforces the correct flow of rinse water through the membrane, which helps remove accumulated contaminants and supports the membrane's lifespan. Recommended replacement every few years and each time the membrane is replaced. Designed for 75 GPD membranes.

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Description

The FR-420 flow restrictor, also called a restrictor, is an important component of a reverse osmosis system installed on the wastewater outlet. It works with a 75 GPD osmosis membrane, enforces the correct flushing water flow, and helps remove contaminants discharged to the sewer. It is a practical component for osmosis filters and reverse osmosis installations that supports proper membrane operation and service life.

What is the FR-420 restrictor used for?

FR-420 is a flow restrictor designed for reverse osmosis systems. It is installed on the wastewater outlet line, that is, the dirty water line directed to the sewer. The component is connected with quick connectors, which makes it suitable for typical solutions used in domestic filtration systems.

Its task is to enforce the correct water flow at the drain. This allows the osmosis membrane to be effectively flushed during operation, and the accumulated contaminants are rinsed out and carried away from the water filtration system.

Why is a flow restrictor important in a reverse osmosis filter?

In an RO system, the correct flow ratio has a direct impact on membrane performance. The FR-420 restrictor supports membrane cleaning because it enforces a water flow that cleans the membrane surface and helps remove deposits and other contaminants.

This is especially important in installations where the water filter operates regularly and comes into contact with water containing a higher level of contaminants. A properly functioning restrictor helps maintain system efficiency and supports a longer service life of the osmosis membrane.

  • installation on the wastewater outlet in a reverse osmosis system,
  • connection with quick connectors,
  • enforcing the correct flow of water flushing the membrane,
  • helping remove accumulated contaminants,
  • carrying flushed contaminants to the sewer,
  • supporting proper operation and service life of the membrane.

Operation and replacement

In the case of very contaminated water, especially water containing a lot of calcium and iron, the flow restrictor should be replaced every few years. Regular replacement helps maintain proper operation of the membrane and the entire water treatment system.

When replacing the osmosis membrane with a new one, a new flow restrictor should be installed. It is mounted in place of the old, worn-out restrictor on the line carrying dirty water to the sewer.

It is a simple but very important consumable component. Its condition affects the efficiency of membrane flushing and thus the stable operation of the entire reverse osmosis system.

Application

The FR-420 model is matched to membranes with a capacity of 75 GPD. It works well as a service or replacement part in RO systems used to improve water quality at home and in typical filtration systems based on an osmosis membrane.

Main benefits

  • helps maintain proper water flow at the wastewater outlet,
  • supports flushing and cleaning of the osmosis membrane,
  • makes it easier to remove accumulated contaminants to the sewer,
  • affects proper operation of the osmosis filter,
  • supports membrane service life in the RO system,
  • is designed for 75 GPD membranes,
  • is installed with quick connectors.

Technical specifications

ModelFR-420
Product typeFlow restrictor / restrictor
ApplicationReverse osmosis systems
Installation locationOn the wastewater outlet, on the line carrying dirty water to the sewer
Connection methodQuick connectors
Intended for75 GPD osmosis membranes
FunctionEnforces the correct flow of water flushing the membrane and supports the removal of contaminants
Operating recommendationsReplace every few years with very contaminated water; also recommended with every membrane replacement
Product Details
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FLOW420
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Data sheet

Model
FR-420
Flow restrictor rating
420 ml/min
Accessory type
Flow restrictor
Compatibility
Universal RO systems
Product type
Flow restrictor

Questions

What is the FR-420 flow restrictor used for?

FR-420 is used to enforce the correct water flow at the wastewater outlet in a reverse osmosis system. This allows the osmosis membrane to be flushed and contaminants to be effectively carried away to the sewer.

Where is the FR-420 restrictor installed?

The component is installed on the line carrying dirty water, that is, on the wastewater outlet in the RO system.

Which membrane is the FR-420 flow restrictor suitable for?

FR-420 is designed for osmosis membranes with a capacity of 75 GPD.

Does the FR-420 affect the service life of the osmosis membrane?

Yes. A properly functioning restrictor supports membrane cleaning, helps remove deposits and contaminants, and contributes to its proper operation, which matters for membrane durability.

How often should the flow restrictor be replaced?

With very contaminated water, especially water containing a lot of calcium and iron, replacement every few years is recommended. Regular replacement helps maintain effective membrane performance.

Should the restrictor also be replaced when the membrane is replaced?

Yes. When installing a new osmosis membrane, a new flow restrictor should also be installed, replacing the old component on the outlet line.

How is this restrictor connected?

FR-420 is connected with quick connectors, which makes installation and replacement easier in typical reverse osmosis systems.

Is this component necessary in every reverse osmosis system?

The flow restrictor plays an important role in RO system operation because it determines the membrane flushing conditions and proper flow at the outlet. Its correct operation is important for the effectiveness of the entire water filtration system.

Ocena 
Kasia R.
2025-12-08

Mały a skuteczny ☺

Ten ogranicznik jest malutki, ale robi robote! Montaz trwal chwile, a filtracja dziala bez zarzutu – swietny dodatek do mojego systemu osmozy.

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FR-420 flow restrictor

FR-420 flow restrictor

FR-420 restrictor (flow limiter) for reverse osmosis systems, mounted on the wastewater outlet. Connected via quick couplings. It enforces the correct flow of rinse water through the membrane, which helps remove accumulated contaminants and supports the membrane's lifespan. Recommended replacement every few years and each time the membrane is replaced. Designed for 75 GPD membranes.