What is the Function of GPD in RO Membranes? Complete Guide 2025
What is the Function of GPD? A Complete Guide to GPD Membranes in Water Purifiers
Introduction
Clean drinking water is no longer a luxury—it’s a necessity. With rising concerns over water contamination, RO (Reverse Osmosis) water purifiers have become a standard household and industrial requirement in India. One key term that often comes up while choosing an RO system is GPD, which stands for Gallons Per Day.
If you are new to the RO industry, you might be wondering: What is the function of GPD? Why does it matter when selecting an RO membrane or purifier? In this detailed blog, we’ll answer all these questions and more. We will also explain how GPD rating affects water purification performance, water flow, and efficiency, while also guiding you toward the best domestic and industrial membranes available on Romegamart—India’s largest B2B platform for RO and water purifier products.
What is GPD in RO Membranes?
GPD (Gallons Per Day) is a measurement used in RO water purifiers to define the water output capacity of an RO membrane. It indicates how many gallons of purified water a membrane can produce in one day under ideal test conditions.
For example:
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A 75 GPD membrane can produce 75 gallons of pure water per day (approximately 280 liters).
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A 100 GPD membrane can produce 100 gallons per day (around 380 liters).
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A 300 GPD membrane is mostly used in commercial and industrial RO systems.
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The Function of GPD in Water Purifiers
The primary function of GPD is to determine how much water an RO membrane can purify in a given time frame. But beyond that, GPD also plays a critical role in:
1. Water Output Efficiency
A higher GPD rating means the RO system can produce water faster. For example, a 100 GPD membrane provides more water per hour than a 75 GPD, making it suitable for larger families.
2. System Suitability
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Low GPD (50–75 GPD): Ideal for small families (2–4 members).
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Medium GPD (80–100 GPD): Perfect for medium-sized households (4–6 members).
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High GPD (200+ GPD): Recommended for offices, restaurants, and industrial purposes.
3. TDS Handling Capacity
The GPD membrane function also correlates with TDS (Total Dissolved Solids) levels. Higher GPD membranes often handle higher TDS water more efficiently, ensuring safe and clean drinking water.
4. Pump and Power Compatibility
Each GPD rating is compatible with specific booster pumps and pressure settings. For instance, a 75 GPD membrane typically works best with a 100 GPD booster pump.
Why Understanding GPD is Important
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Prevents Overloading the System: Using a lower GPD membrane in a high-demand household may cause water shortages.
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Ensures Optimal Performance: Choosing the correct GPD prevents the purifier from underperforming.
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Helps in Cost Savings: Correct GPD selection ensures long-term durability and lower replacement costs.
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Improves RO System Life: A membrane with the right GPD rating reduces stress on pumps and filters.
If you are confused between options, check Romegamart’s detailed comparison blogs:
Types of GPD Membranes
Depending on usage, GPD membranes can be divided into domestic and industrial categories.
🔹 Domestic GPD Membranes
These are typically between 50–100 GPD, used in homes and small offices. Popular sizes include:
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50 GPD Membrane – Entry-level, affordable, suitable for low water usage.
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75 GPD Membrane – Most common, balances price and performance.
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100 GPD Membrane – Higher water flow, perfect for families with 5+ members.
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🔹 Industrial GPD Membranes
For large-scale requirements, industrial membranes range from 200 GPD to 10,000 GPD or more. They are used in:
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Factories
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Hotels & Restaurants
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Hospitals
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Commercial RO Plants
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Factors That Affect GPD Performance
Even if you purchase a high-GPD membrane, its real output can vary. The function of GPD depends on several external factors:
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Water Pressure: Low inlet water pressure reduces membrane output.
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Water Temperature: RO membranes work best at 25°C. Cold water slows production.
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TDS Levels: Higher TDS means more workload on the membrane, slightly lowering output.
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Pre-filter Condition: Dirty sediment and carbon filters reduce water flow to the membrane.
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Pump Power: Using a weak pump with a high-GPD membrane decreases efficiency.
GPD Membrane Price in India
Price is another key factor when selecting GPD membranes. Generally:
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75 GPD membranes are budget-friendly and widely available.
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100 GPD membranes cost slightly more but deliver higher performance.
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Industrial membranes are priced higher due to their larger capacity and durability.
For updated pricing, visit:
FAQs on GPD Function
Q1. What does GPD mean in RO membranes?
It means Gallons Per Day, the water purification capacity of the membrane.
Q2. Which is better – 75 GPD or 100 GPD?
For small to medium families, 75 GPD is sufficient. For larger families, 100 GPD is better.
Q3. Can I use a higher GPD membrane in my RO purifier?
Yes, but ensure pump compatibility and water pressure match the membrane requirements.
Q4. How long does a GPD membrane last?
On average, 1–2 years, depending on water quality and maintenance.
Conclusion
The function of GPD is to measure the daily water purification capacity of an RO membrane. Choosing the right GPD ensures your RO system performs efficiently, delivers sufficient pure water, and lasts longer. Whether you need a 75 GPD domestic membrane or a high-capacity industrial GPD membrane, RomegaMart provides a trusted B2B platform with verified suppliers, wholesale rates, and PAN-India delivery.
👉 Explore the best GPD membranes today:
By understanding the function of GPD, you can make smarter purchase decisions and ensure safe drinking water for every need—domestic, commercial, or industrial.
