Watering from the hose without feeding is fine except for the Chlorine and Bromamine (City water). If one is feeding with synthetics you should at least PH your nutrient solution for better uptake. Yes the raw tap water waters your grass and bushes fine and keeps them green but you are trying to maximize your grow, just not get by. My question would be can you even grow organically outdoors with city tap water. Indoors is ok because a RO machine or letting a couple of buckets evaporate out the chlorine works when you don't need a lot of water. I live where it's hot and might be using a 100 gal a day in the extreme heat. I would need a water silo to store water and Evap chlorine. Don't know what to do about the Bromamine. I got a inline RV water filter and are going to try pure organics this year with amended soil, top dressing with guanos and feeding teas. If it doesn't work back to the synthetics we go. I have yet to test PPM's and PH coming out of the filter.