RO System Size Calculator
Include everyone who lives in the house.

Include appliances like dishwashers and washing machines.

Test your water to know its TDS level. RO is more effective with higher TDS.

Recommended RO System Size:


Choosing the right size Reverse Osmosis (RO) system for your home requires consideration of several factors to ensure you select a unit that meets your water purification needs. Here's a detailed guide to help you make an informed decision:

1. Determine Your Water Usage:

Daily Consumption:

Calculate the daily water consumption of your household. The average person uses about 80-100 gallons per day, but this can vary based on lifestyle and appliances in use. Don’t forget to consider water used by appliances like dishwashers and washing machines.

Peak Hour Demand:

Identify peak usage hours and estimate the maximum water flow needed during this time. This is crucial to ensure that the RO system can handle your household’s demand when it’s at its highest.

2. Understand Water Quality:

Source Water TDS (Total Dissolved Solids):

Test the TDS level of your incoming water. RO systems are more efficient when the TDS level is higher. If the TDS level is too low, an RO system may not be necessary.


Identify specific contaminants in your water. RO systems are effective at removing a wide range of impurities, including salts, bacteria, and particulates. Knowing the contaminants can help in choosing a system with the appropriate filtration stages.

3. Evaluate System Capacity:

RO systems are rated by their production capacity, typically measured in gallons per day (GPD). Ensure the system's GPD rating is sufficient to meet your calculated daily water usage. A good rule of thumb is to choose a system with a capacity of 1.5 to 2 times your daily needs to ensure adequate supply, even during peak usage.

4. Tank Size:

Storage Tank:

The RO system will fill a storage tank with purified water. Make sure the tank is large enough to hold a sufficient water supply for your peak hour demand.

Pressure Tank:

Ensure the pressure tank is adequately sized to provide consistent water pressure throughout your home.

5. Maintenance and Filter Replacement:

Check the manufacturer’s recommendations for filter replacement and system maintenance. Ensure that you are comfortable with the maintenance requirements and the associated costs.

6. Space Requirements:

Make sure you have enough space to install the RO system and storage tank. Check the dimensions of the system and compare it to the available space in your home.

7. Budget:

Balance your budget with your needs. More expensive systems may offer higher capacities and additional features, but they might not be necessary for your particular situation.

8. Brand and Warranty:

Choose a reputable brand with good customer reviews. Check the warranty and after-sales service options to ensure you have support if any issues arise.

9. Installation:

Consider whether you will install the system yourself or hire a professional. Ensure the installation cost is factored into your budget.

10. Environmental Impact:

RO systems waste water during the filtration process. Consider systems with higher water efficiency or those that recirculate the waste water for other uses to minimize water waste.

By carefully evaluating these factors, you can select a Reverse Osmosis system that fits your household's needs, ensuring a constant supply of clean, purified water.


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