Originally Posted by radshifty

Don't (ever) say anything weed related. Just say you've got some tomatoes, and you're a first time hydroponic grower. Tell them you want some basic nutrients (ask for the Cutting Edge OR General Hydroponics) and a TDS tester. Usually the gallon size nutrients are the best bang for the buck. Tell them you also need some pH up AND pH down, as well as some cleaning solution for when you flush. They'll know what's up and tell you everything you need to know, but don't buy anything you didn't plan to buy that day. If they suggest something, go home, study, and go back the next day. Just tell them you have to transfer more money into your accout or some shit. That way you know what you're getting into BEFORE you get into it. Kapish?

EDIT: And when you test the pH of your water (after adding nutrients of course) you want it to be 5.8