I'd go with the website, you read it yourself.

Logically... should it matter if you put either one in first?

kinda like asking if the glass is half empty or half full
BobBong Reviewed by BobBong on . GH nutrients Is ther any special way u have to add the GH 3 part solutions to the resivior? I've heard alot that you have to mix the micro then the grow then the bloom is that true? Only reason I ask is that I went to the GH website site and it specificlly said order does not matter. Rating: 5