bicycle racer
Well-Known Member
when dealing with tap water even when ph adjusted it can often rebound back up because of a high buffering capacity. even when ph is kept under control you will still eventually build up salts especially in soil this causes various problems. i sometimes use a small amount of tap to replenish minerals as you said but only at a ratio of 1 to 10. if your using a good complete fert line up its not normally needed. i have done grows with tap only i had much better results overall with the ro or distilled the huge majority of knowledgeable growers would agree. there are some areas where the tap is of low ph and dissolved minerals in which case its fine to use. but in most places its very alkaline and not desirable as an example my tap has 300 to 375 ppm dissolved solids and a ph of almost 8.