Not good, not good!
@Alter Jean @osowhom
I watered the Hindu Kush (the one with more stains) with a bottled mineral water with pH 6.6 and tds 30ppm (which I use to calibrate my meter).
The runoff pH was 5.8 and tds was 180ppm, the water had a light green tone.
I am thinking to buy and use a...