I used to have a chart for 321 and their other 1 part powders (city/well vs RO I think?) as an aside, if you ever need to chat with them, the owner's daughter (a PHD herself ) answered all the questions (issues too) with the 1 part. I had a really weird massive pH drop at about day 4 in my res. they all ended up being lawn fertilizer unfortunately.
Im hoping it's as easy as everything I read. I made sure I mixed them thoroughly and in order. I just fed everyone tonight. Gotta dust off the ole flowering green thumb. Haven't did a flower run in 3-4yrs