@Irishk,
Yeah, so that's not actually a good test. After I experimented a couple times and got higher readings than the original, Mr.Irish explained it to me. Boiling doesn't eliminate dissolved solids/minerals, etc. - in fact, may even make the ppm reading higher due to evaporation, blah blah. So, did everyone figure this out except for me???
It
is a useful device to test your filtration system, though.