RO membrane GPD converter helps you compare reverse osmosis membranes by converting GPD into liters per day. It supports membrane selection for your needs (kitchen, food service, aquarium) and provides a quick estimate of whether the system can keep up with demand.
Manufacturer ratings are typically based on specific test temperature and pressure. In real installations output can be lower due to cold water, low pressure, clogged prefilters or high TDS.
FAQ - RO membrane GPD
What does GPD mean?
GPD stands for gallons per day. It is a nominal rating measured under test conditions.
How many liters per day is 75 GPD?
Roughly 75 GPD is about 280-285 L/day. Actual output depends on temperature, pressure and water quality.
Why is real output lower than the spec?
Common reasons are cold feed water, low pressure, clogged prefilters, incorrect flow restrictor or high TDS.
How does temperature affect RO output?
Colder water reduces membrane production. Seasonal drops are normal, especially without a booster pump.
How does pressure affect RO output?
RO needs sufficient pressure. Low pressure lowers output and may worsen efficiency.
Does a booster pump increase output?
Yes. A pump stabilizes pressure and often improves both output and membrane performance in low-pressure installations.
How do I choose a membrane for my use case?
Consider daily demand, usage pattern and tank size. For food service or aquariums, extra capacity is often recommended.