I been seeing people have ppm of 1000+ I don't think I have gone past 400, I followed the canna websites feeding chart too but it doesn't look like I had any deficiencies throughout the grow. Like i said this is my first grow I tried to read up on as much as I could the only thing I didn't do was ad any other nutes because I didn't want to mess up and overfeed them, but i think I'm doing ok idk lol