leaves you with nothing but H2O, so you will really not be able to measure the pH very well (since pH is a measurement of the H+ ions, and the water is de-ionized) and there is essentially no buffer at all (KH
=0). It is a "clean slate" to which you add the salt mix, which provides everything that needs to be there.
My tanks: 120 Reef w/L2 Algae Scrubber, 60 Reef Pond w/floating Algae Scrubber, 40 Breeder Reef w/L2 UAS Tester Algae Scrubber
I maintain: 144 SW Reef w/L2 Algae Scrubber | 200 SW Reef w/L4 Algae Scrubber
Special knowledge: Algae Scrubbers, Acrylic Fabrication