Before and afters.. I'm confused.

[OCDP]

Originally Posted by Ruth

At the place that I buy my water from I get them to test the TDS of their RO water (which they do regularly anyway). It comes out at less than 1ppm consistantly.

That's good to know...

We're talking about RO water you can get from grocery stores and what not, correct?

What's the (rough) cost to fill a jug of RO water? (the bigger jugs they have) I top up with about half a gallon per day, and I'd like to try and calculate my costs if possible..