How do I check the total dissolved solids in the water?

On The Go® provides every customer with a battery powered, hand held TDS digital meter that will provide a range of 0 to 1000 PPM. This meter is very simple to use and will give you an instant read out. You can check TDS of the water source to determine capacity and also use the meter to check the output of the DI unit to determine when change-out is necessary.