pH down living soil

My tap water also comes out at about Ph 9 and was constantly adding PH down to keep it at around 6-7 when I finally decided to get one of those home water test and realised that I have super high Alkalinity. Basically the water has some minerals that keeps it at around 9 no matter what I do. so my solution was a RO system and then adding back 10-15% of tap water and that keep it stable at around 6.8. Get a home water test and test your water to figure out what your problem is. "Water alkalinity and pH are not the same. Water pH measures the amount of hydrogen (acid ions) in the water, whereas water alkalinity is a measure of the carbonate and bicarbonate levels in water. Think of carbonates and bicarbonates as dissolved limestone."