TDS Measurement and Reverse Osmosis

The video tutorial explains the concept of total dissolved solids (TDS) and how to measure TDS levels using an Apec water filtration system. It demonstrates the process of rinsing cups and a TDS meter with reverse osmosis water, measuring TDS in both RO and tap water, and calculating the rejection rate of the filtration system. The tutorial concludes with an explanation of interpreting the rejection rate and when to replace the membrane if the rate falls below a certain threshold.

What does TDS stand for in the context of water filtration?

• Total Dissolved Substances

• Total Dissolved Sugars

• Total Dissolved Salts

• Total Dissolved Solids

Why is it important to monitor TDS levels in water?

• To measure the water's pH level

• To check the filter system's rejection rate

• To ensure the water is cold

• To determine the water's color

What is the first step in measuring TDS using the Apec water filtration system?

• Shake off excess water from the meter

• Fill the cups with tap water

• Rinse two cups with reverse osmosis water

• Rinse the TDS meter

What should you do to maintain accuracy when using a TDS meter?

• Shake it vigorously

• Use it only once

• Rinse it with reverse osmosis water

• Use it in direct sunlight

How do you calculate the rejection rate of a Reverse Osmosis system?

• Multiply the TDS of tap water by the TDS of RO water

• Divide the TDS of RO water by the TDS of tap water

• Subtract the TDS of RO water from tap water TDS, divide by tap water TDS, and multiply by 100

• Add the TDS of tap and RO water

What was the rejection rate calculated in the example provided?

• 90%

• 95%

• 98%

• 99%

What percentage of contaminants should a good Reverse Osmosis system remove?

• 90-99%

• 70-80%

• 50-60%

• 100%

When should the membrane of a Reverse Osmosis system be replaced?

• When the rejection rate falls below 50%

• When the rejection rate falls below 80-90%

• When the rejection rate falls below 60%

• When the rejection rate falls below 70%