did you get the ph tester drops and guide with it? Both the up and down are very strong! You only need a drop or two to raise/lower ph. Add a drop in your watering container and check the ph....if you need more, add a little more. But just a little at a time as that stuff is really potent. And wear gloves! I made the mistake on not wearing gloves and got some down on my fingertip.....it's been over 2 months and it still isnt healed all the way! be careful!:jointsmile: