[pHaestus]

I also seriously doubt that this stuff can remain deionized for more than a few moments at pH 7; the fluid has to be in equilibrium with dissolved CO2. That means at pH 7, HCO3- = 10-4M just from speciation of dissolved carbon dioxide gas. That reaction also produces a proton, so your ligands in solution would have had to be negatively charged initially (and contributing to ionic strength then eh?) to buffer the pH and hold it at 7. This gets to the fundamental point: I don't understand how a ligand can be added to the system without affecting ionic strength (and therefore EC). These claims seem incorrect to me, but I could certainly be missing something here in the formulation.

As an aside you can't even accurately measure the quality of deionized water by pouring it in a beaker and putting an EC probe into it. It takes up dissolved CO2 THAT fast. Raindrops are in equilibrium with CO2 before they hit the ground. Not this FluidXP+ stuff tho eh?

The other thing that seems bogus is that it is crystal clear that the people vocally in support of this product have very few posts and in fact registered just to talk about it. If you are affiliated with the company then be honest about it. Otherwise you look like a scam artist (and this IS $25 deionized water w/ a small amount of additive we are talking about).

//EDIT! Ah I looked up their conductivity of 76 uS/cm: More like an ionic strength of 5x10-3M...not "same as deionized water" at all. The readings WOULD be close if the deionized water is measured open to the atmosphere though (and therefore not deionized). Probably not purposefully misleading just poor analytical procedure. Back-calculate resistivity Mr. FluidXP+ guy and I bet the reading for your water purification system is nowhere near 18.2 MOhms (assuming you start with truly deionized water).