I'm going away for a week and my boyfriend's brother is gonna house sit. I'm giving him some basic instructions. Can I premix all the nutes in 1gal of water for a few days for him? Or is it better if he mixes it himself? Thanks!
Your in a dwc, so no need to even shake it. The airstone will re oxygen it in no time. Pre mix is good for 1 week at least. I ran a rdwc and didn't change the resivoir or add anything for 4 weeks in veg with no issues.
The problem with premixed is the oxygen goes out of the water after about 24 hours. Just shake it up a lot just before you water to get as much oxygen in the water and on the roots. Your plants will love you for it. Chuck.
Premix its less chance for a fuck up. Just tell him to shake the gallon good before feeding. Your ph should be stable for that time. As a caution you can teach him how to ph if needed.