Advice from a Microelectronics Guru.
Dionizing filters remove all contaminants and organic ions from the water. They use them in the silicon processing industry to make Integrated circuit chips, and there must be no contaminants at all to achieve 1/2 micron geometries in the photolithography process. All the active ions are stripped from the water by catalytic resin beads which are treated with acid and caustic solutions separately, them mixed dry in a 50/50 mixture inside the filter. It works well for all cleaning operations as it does not have anything in it that will promote oxidation. It will keep aluminum looking brand new, without any discoloration. The degree of "hardness" of the water that you are using, and how much you run through them will determine how long the filter remains effective. Millipore makes some good large volume filters if you are thinking of a permanent installation. They are somewhat pricey however. Due to the extreme purity of the water, they do tend to grow "bugs" kind of like algea on the filters if they are not used regularly. Also, don't drink from the hose, D.I. water will leach the calcium from your body. Because it has no active ions in it, it will attempt to extract active ions from what ever it contacts.
