growdoctordccommentedweek 17 years ago
Agreed @dudegrowsweed! pH is the single most important factor, whether you’re farming or maintaining swimming pool water.
I paid $13 on amazon for a meter that works - I’ve tested it against a dropper based pool test kit and it’s spot on. No need to spend big bucks. But there is a need to spend $13
Eventually you’ll want a real grow light also.
Best of luck
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