R/O Units remove UP TO 90% of the total dissolved solids in the water, the DI unit if you have one will remove about 99.99% of what gets past the R/O unit. The R/O unit saves the DI filter so you don't have to spend $$$ replacing the DI medium all the time. The harm is not knowing what those dissolved solids are. Heavy metals? sodium, carbonates etc....
The other thing a TDS Meter is good for is testing the water that comes out of your R/O unit, whent he TDS start to rise you know it is time to change the membrane.
|