My grow is a great example of the lack of minerals. Which might explain the powered mildew i come across. I notice the healthy plants have next to zero PM but the sick ones is constantly being sprayed for that shit. Lesson learned, if using ro make sure you have the right supplements! Where would you get one of those refractors? are they expensive?
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You're right about that, minerals are necessary. No, they are THE KEY!
Refractometer is around $30-40 a pop on Amazon. Get one, cause it's really worth it! It's like a compass for growing weed.
Im speechless!