215
people found this helpful, as of 2023
ranked #144,163 most helpful
out of 571,544,897 reviews
★★★★★
PH Control
I've used it one time and it was very effective. Since purchasing this kit I've read a book on beginning hydroponics--apparently you can use vinegar to lower the PH and baking soda to raise it it you don't want to spend the money on this kit.
the product in question
General Hydroponics pH Test Indicator, 1-Ounce
4.7★ · 1,729 ratings, as of 2023