In-Line TDS Meter - Water Quality Tester

Measure the tap water coming in vs. the purified water going out of your water filtration system at any time.

Specifications

Calculate Rejection Rate

A TDS meter is a great tool for calculating the effectiveness of your reverse osmosis system by measuring the total dissolved solids (TDS) content of your water both before and after the reverse osmosis system. You can also use these readings to tell you when the membrane needs to be changed.

The filtered water's TDS reading should be within 3-10% of your tap water's TDS reading. This is a normal range. You should test your water once or twice a year to monitor your RO membrane condition. When your filtered water's TDS readings increase to 15-20% of your tap water's TDS reading, then it is time to replace your membrane.

Once you have obtained the TDS levels of your tap water (IN) and filtered water (OUT), use the calculator below to determine the rejection rate of your reverse osmosis system.

Enter the TDS level of the filtered water
Enter the TDS level of the tap water
Rejection Rate= %






TDS Range In PPM


Dual In-Line TDS Meter Setup