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i have a ebb and flow setup and a 115 gallon reservoir but im not sure how much of the ph up and down to use. the ph is at 7.0 so i just poured in a small amount, can anyone let me know how much i should be adding.

obviously if u know your taking a drug test there is plenty of things you can do but for random drug tests or if u get hurt at work and have to take a test right away then this is a really good idea........i have a few friends who still have their jobs because of this. my work has a nurse come...

i work in a warehouse and anytime you are in an accident or get hurt you have to take a drug test immediately........so everyone i know there that smokes weed fill an empty bottle of visine with bleach and when they get the drug test they will put a few drops on their finger and let it dry then...