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hello just curious if anyone has calibrated a TDS meter to zero using distilled or deionized water and if its accurate in future. if not what's the preferred level to calibrate a meter to either ppm or ec.

Hello second post. I have 2 grows one in closet with 2 200watt led boards and a 4x8 tent w 2x GC ROI-E680s. I’m almost to harvest in my first grow ever under the 200 watts in the closet and although all my plants are doing great some of the plants have very purple stems that run all the way up...

hi eveyone this is my first post and im still a newer grower have just done closet grows with sf2000 spider farmer lights and have just done autos so far. im getting big boy gorilla grow tent and looking for best light for my main big boy tent. I see growers choice is fan fav good warranty...