If I have some nutrients mixed in distilled water is it ok to save it if I use it within a week? I hate throwing extra away. Plants are really starting to soak it up.“figured this would happen” plants are about 6 weeks so awhile to go.
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I would contact manufacture and ask about it. But my experience is its not preferable and ph can go astray as well
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I use Jacks and mix 5 gallons at a time. It usually takes almost 4 days for me to go through it. I use a small aquarium wavemaker, to keep it pretty well mixed, and monitor the pH. I’ve gone 8 days on the same batch 
It’s best to use them right away, though, and like @Audiofreak stated, check with the manufacturer.
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Thanks for the feedback. I usually only have about a gallon that I would use in 4 days or so
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As long as the nutes are salt based and you aren’t adding any sort of microbes or organics you should be fine. I’ve had reservoirs of jacks stand for 2 weeks without any adverse effects. Just keep your pH in check.
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@Guar 
this
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Ive been using jacks 321 and i mix 5 gallons at a time. Just make sure it all dissolves, and you ph it before each use. I am fortunate that jacks mixed woth my water leaves my ph right about 6.4
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Simple answer is that its not ideal. If your plants eat it right up with no problems and you dont see any negative visual change id say keep saving that money. But if you notice anything negative going on id stop doing it immediatley and see if it gets better
Are you adding cal mag to your distilled water?
Jacks has been very easy to use. Have learned a few things. Warming some water to mix in helps dissolve all nutes. Any nutes visible on bottom is not a good practice to have.
Watering immediately after mixing has given my girls a reaction. Mix is brownish red after mixing, allow mix to clear up some, 15 to 30 minutes prior to use.
My girls curled their toes 270 degree in dislike. Dont know why, but its a reaction minutes after feeding.
I was using well water, not sure what waters might cause nutes to go bad faster.
Some use rainwater, ro’s, distilled, tap and other sources. How each one may effect nutes would be good to know. Maybe theres no effect.
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Yes I add Cal mag everytime. If I do keep the little left over I’ll keep eye on pH. Guess I could use it for regular house plants.
Didn’t mention, I’m using general hydroponics.
The jacks i use contains cal mag. So i dont addamy extra at this time.
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