Add Calcium to your DI water

[Canadian]

Originally Posted by medhatreefguy

I know how TDS is measured, I've never heard of 13 to 15 ppm out of a tap.

TDS in the neighborhood of 9-25 is pretty much the norm over here on the west coast. It'll go up a bit when the municipality cleans the water mains or when there is a big rain that increases sediment as RuGlu6 mentioned.

[viperfish]

Now that is amazing! Your RO system must last forever. In Medicine Hat we are in excess of 200.