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A flow restrictor (FR) with a 300ml capacity is a small but important component in most RO (reverse osmosis) water purifiers. Its primary function is to regulate the flow rate of water through the RO membrane. The 300ml designation refers to the approximate amount of water it restricts the flow to, influencing the overall performance and efficiency of the RO system. By controlling the flow, the FR helps maintain optimal pressure across the membrane, which is crucial for effective filtration and the production of purified water. These flow restrictors are typically designed for universal compatibility with various RO water purifier models.