Max PPM concentration for IC40


Silver Supporter
Apr 6, 2018
Sugar Land, Texas
Here in Houston we get some very heavy rains. Sometimes 10-15” in one day/two period. Last time I went on vacation this happened and my salt reading on my cell went from 3600 to 2600 while I was gone and cell quit working. I’d like to put my PPM at 4400 or so and this is what cell reads not what I measure with Taylor kit. They are about 200 pm different in summer. Regardless I’m worrying about what cell shows. At what point does high ppm become a problem? 4500? 5000? If I have a little salt taste I can live with it. Are there any other problems to know of? Will cell flash red at some point? Shut cell off?


TFP Expert
Mar 2, 2011
The cell should work up to 10,000 ppm. At 4,500 ppm you will get a high salt indicator but the cell will still work.
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