My issue w/ the tap water where I live, is pretty plain. We have bad tapwater. The chlorine content is through the roof. Our community has gottin together w/ our water district, and were successful in having the procces refined, but unfortunetly not good enough to use it w/ canna. Reguarding the ph adjustment to the water: granted it may be the last few days of watering, but as in everything I do I tell myself: "Butcher, the first is just as good as the last", so from the very first watering down to the last I P.h adjust and let it float up. This just gives me the peace of mind that I've put everything I got into what I do. And that my meds have had the best process I can provide, esspecially since they are goin into my body.