TDS Meters

TDS Meters

TDS Meters For Testing of Total Dissolved Solids in Your 3M, Aqua-Pure, CUNO or Water Factory Reverse Osmosis System. Check the performance of your RO Reverse Osmosis membrane.

Checking the TDS (total dissolved solids) is the only way to know if your RO reverse osmosis membrane is performing correctly.

Easy TDS Membrane Performance Calculator
See If It is Time To Replace Your Membrane

Simply enter your Feed Water TDS and RO Water TDS into the boxes above and click "Submit". The percentage of TDS Rejection will be displayed. We normally recommend membrane replacement once you drop below 75%. This may vary in areas with high TDS in the feed water.

See our selection of TDS meters under Water Tests