can I de-cloranate the waterat the same time?

Can I de -cloranate my res water, at the same time as mixing my nutrients a few days in advance to save time /space. Then balance my ph pefore use?

Chlorine works its way out of the water very quickly via evaporation. We're talking a few hours, max. If you're concerned about chlorine, leave the lid off your reservoir for a few hours before OR after you've mixed your nutes. Either way, it won't change your pH.