And just so you know. The only way to know the true ph of you soil is by a slurry test.(testing the medium itself) Testing runoff to get a soils ph is a waste of time. It will only get you chasing your tail even more...........When vinegar is used as a ph down(nothing the matter with it)and once in the medium. Bacteria begin to breakdown the vinegar into compounds the plant can use. But this breakdown also make it lose it ability to buffer ph. Simply flushing with water in a certain ph range will not change the mediums ph long term. Lime, certain acids, oystershell, gypsum and worm castings to name a few things used to adjust a soils ph long term........