Total dissolved solids (TDS) is a measure of the combined content of all inorganic and organic substances contained in a liquid. These inorganic and organic substances are normally referenced for freshwater systems.
You can use the HM digital® TDS meter to determin if your Reverse Osmosis membrane is removing impurities from your water. The Premier item number for the TDS meter is 273001.
Follow the steps below to have our online calculator calculate your effectiveness of membrane.
Now that we have the membrane's rejection rate, what does this mean?
The rejection rate is the percentage of the amount of TDS (Total Dissolved Solids) eliminated from the tap water by the membrane. Example: A 90% rejection rate means that 90% of the TDS has been eliminated from the tap water.
If your Membrane Effectiveness is between 75-100% your membrane is operating within factory specifications.
If your Membrane Effectiveness is 74% or less then we recommend replacing your membrane and the flow restrictor as well as the pre and post filters.