How long will mixed organic nutes last?

[Dwman420]

Hi just wondering i use green planet medi one nutrient line with green planet cal mag i just set up an automatic watering system because I'm sick of hand watering. Quick couple questions anyone know how long these can sit for mixed? Also should I install a stirring pump and air stones?

 

[Pippins]

I always think bubbling is a good idea, helps keep the solution fresh and mixed, adds dissolved oxygen, and maybe keeps the anaerobic bacteria from taking hold. Maybe add some beneficial bacteria to the mix. I just hand water, drain to waste, but my solution stayed fine for 3 days at least. BUT I was using citric acid as a ph down and was having to adjust the PH before every feed. Bubbling your nutes will constantly raise the PH.