New Grower How long should I keep nutrients in water???

[Peter Pan]

Hello Afn
Another Noob question.
It would be convenient for me to have a big tank with all my nutes in there and phd so I can take whenever I need it, instead of measuring all the time and counting ml/L. But Can I do that or nutes will decompose??/
THANKS A LOT ONCE MORE DEAR FAMILY

 

[Chester]

Nutes will go bad ... best to mix w/ each watering ...

 

[Terraformer33]

Whenever I premix a gallon of nutes it always seems to stink way to much after a few days I don't want to water it on anything close by or i would smell it. I guess I figured it must not be good anymore so I don't premix now. Best to mix and measure fresh every time.