RO-90 – Waste Water Ratio Test

### RO-90 – Waste Water Ratio Test

#### Introduction to Waste Ratio Testing

The efficiency of an RO (Reverse Osmosis) system is often determined by its waste water ratio, which indicates the amount of waste water produced relative to the amount of pure water generated. In the case of the RO-90 system, it typically consumes 4-5 gallons of waste water to produce 1 gallon of pure water, resulting in a waste ratio of 4:1 to 5:1. A lower waste water ratio can indicate higher Total Dissolved Solids (TDS) in the pure water, which is undesirable. This comprehensive guide will walk you through the process of conducting a waste water ratio test for the RO-90 system.

#### Importance of Waste Ratio

Understanding the Waste Ratio

The waste ratio is a critical parameter for assessing the performance of an RO system. A higher waste ratio than the expected 4:1 to 5:1 suggests inefficient operation, while a lower ratio indicates potential issues with the system that need to be addressed. Maintaining the correct waste ratio ensures optimal water quality and system efficiency.

#### Step-by-Step Test Procedure

Preparation for the Test

Before beginning the waste ratio test, ensure that the RO system is functioning normally. Close the tank valve to isolate the system and prepare for the test.

Drain Line Preparation

Remove the BLACK drain line from the drain saddle and place it in a bucket to collect the waste water. This step is crucial for accurately measuring the amount of waste water produced during the test.

Collecting Pure Water

Next, detach the clear line from Point C3 on the ASO. Pure water will begin to flow out of the line in a small stream. Use this stream to fill an 8oz cup, which will serve as your sample of pure water.

Measuring Waste Water

While the pure water is being collected, measure the amount of waste water in the bucket. The goal is to determine if the waste water volume is approximately 4 to 5 cups, aligning with the expected waste ratio.

#### Recording and Analyzing Results

Recording the Waste Water Volume

Once the waste water has been collected, record the volume in the bucket. This data is essential for calculating the waste ratio.

Calculating the Waste Ratio

Compare the volume of waste water collected to the 8oz of pure water. The waste ratio should fall within the 4:1 to 5:1 range. If it does not, further investigation and adjustments may be necessary.

#### Troubleshooting and Maintenance Tips

Addressing High TDS Levels

If the waste ratio is within the expected range but the TDS levels are still high, there may be issues with the RO membrane or pre-filters. Regular maintenance and replacement of these components can help maintain optimal performance.

Ensuring Proper System Operation

Regularly check for any leaks or blockages in the system that could affect the waste ratio. Proper operation and maintenance of the RO system are key to achieving the desired waste ratio and water quality.

#### Conclusion

In conclusion, the waste water ratio test is a vital part of maintaining the efficiency and performance of the RO-90 system. By following the outlined steps and recording accurate measurements, you can ensure that your RO system operates within the optimal waste ratio range, providing high-quality pure water while minimizing waste. Regular maintenance and troubleshooting can help address any issues that may arise, ensuring the longevity and efficiency of your RO system.