With a proper functioning Reverse Osmosis system, the level of Total Dissolved Solids (TDS) of your R.O. water will normally be significantly less that of your tap water. A simple way to measure the TDS level is to use a conductivity meter. If your tap water is 400 parts per million and your R.O. water is initially 25 parts per million, you know that there is a problem with your R.O. system if your R.O. water suddenly registers 400 parts per million.

We sell this conductivity meter:

The AP-1: AquaPro (by HM Digital) costs $29 plus shipping. This meter has a one-year warranty. To order a meter, please Click Here. For more info, please go to the HM Digital web site.


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