first time Ro, CaliMag supp?

I'm using the General Hydroponics 3 part expert recirculating feeding schedule... I could have swore they had this on the old general hydro feeding charts but I can't find it anywhere on their site anymore. I just started using RO water for the first time and was wondering peoples opinion on how much calimag to supp with. The bottle says 1ml per gallon, do you guys agree with this or should I use more / less? I used to use tap water and never had a cal or mag problem but I see on all these sites people using RO water and needing to keep a closer eye on their Cal Mag suppliment so I wanted to get a general consensus before adding it in.

Also will it be 1ml per the whole lifetime of the plant, or more / less depending on how much M / G / B I change when transitioning to bloom, bloom, and final weeks?

Thanks!

Don't add anything unless you know for a fact you need it. The G_M_B might have all the Cal-Mag you need, at least to begin. If it starts showing issues then add it.