If your going to save it you'll want to put an airstone in it and keep it lightproof. I've found that if you let the mixed nutes sit overnight with an airstone in it the ph will rise, they are designed this way it's called ph buffering. Mix in a little unsulfured molasses and it will rise more from the beneficial bacteria bloom. Also Foxfarms has two types of Grow Big nutes, for hydro and for soil they will ph buffer differently.