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Waterdrop G3P800

Reverse Osmosis Water Filters
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G3P800
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Waterdrop G3P800

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water-filters

CR's Expert Take

How did it perform in our expert lab testing?

Overall Score

The Overall Score for this model is derived from our expert lab test results.
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Current Range of Tested Reverse Osmosis Water Filters
What goes into the Overall Score?
Flow rate
 /  5
Efficiency
 /  5
Clogging
 /  5

About

Each RO system under test includes multiple connection points: an inlet, a filtered water outlet, a wastewater outlet, and typically an expansion tank that stores reserve filtered water to compensate for the slow production rate inherent to RO systems. Because each unit also contains multiple filter stages with varying rated lifespans, we standardized our test duration around the shortest-rated filter in each system, which was 800 gallons of total input water. All units were tested using the building's well water supply, which is naturally very hard, giving us a realistic and demanding source for evaluating filter performance under mineral-heavy conditions. During testing, we ran the RO continuously, allowing both the filtered water and wastewater to flow throughout the trial. A calibrated meter on the inlet line tracked total water entering the system, and at every 50-gallon interval we recorded the flow rates of both the wastewater and the filtered water, yielding 16 data points across the full 800-gallon run. This let us monitor two key indicators of filter health: whether flow rates declined over time, a sign that filters were beginning to clog, and how the ratio of wastewater to filtered water shifted as the system aged. Tracking this ratio is particularly important because a rising proportion of wastewater relative to filtered water signals declining efficiency, meaning the unit uses more input water to produce the same amount of drinkable output.