socialist pete. FYI. Advanced Nutrients admits the fact themselves. If that makes you feel better. They have used many other companies products and tweaked them...I believe that their 3-part is a direct copy though. they give General Hydroponics (use by NASA) credit in their literature.

JackdaWack. I have always used pure Blend Pro also. Start everything with PBP, then at start of full veg 1200-1500ppm, I switch to 3-part. This gives them a nice "organic" start. I don't know if it helps, but I do know that it doesn't hurt, and It is a whole lot easier to mix PBP, than 3-parts...lol...Just kidding folks; Don't let me scare you.

You know your a grower when you come home with a 400lb bag of perlite. HeHe! Peace