How long does Jack's 321 last after it has been mixed up?

Can I mix a reservoir of 10 gallons with Jack’s pre-mixed and then drip feed on a timer for a week or so?
Will it loose potency and can it hurt my plants?
Indoors in a tent.

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pH tends to drift upwards so you need to check it about every other day and adjust it.
Potency wont change.
Its actually designed for hydroponics so a reservoir is no problem.

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Question in this topic as well. Being that the PH goes up once it sits and I use lemon juice to adjust PH, will adding more lemon juice after it sit throw off acidity. If that’s makes sense and not be good for your plant?

I always use distilled water aerated for 24 hours and mix molasses and jacks and use immediately PH’d to 6.2-6.5

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A pH of 7 is neutral. So anything lower is acidic already. I know lemon juice is acidic and works.
The reason pH down in bottle form works is that it is phosphoric acid. Phosphoric acid is a plant food so its safe as well.

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I would not let lemon juice and molasses sit around too long. I also do no add either to my autopot reservoir. If I want to add molasses (which I no longer do) I would top feed and mix / add the day used.

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I don’t let it sit. I mix after water is aerated and feed to my girls immediately. Was basically just wanting to know if I could save some time but no big deal.

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So you think me using lemon juice is a no go? Should I just buy some pH up and pH down?

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I would. Its a more stable predictable product.
Plus its just food for the plant.

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Okay I’ll get some of that!! Thank you @Spiney_norman

Molassas makes my PH CRASH in a day.
In a week the solution get down to under 5.
Big trouble for my FFOF soil

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I agree with others suggesting use of dedicated hydroponic adjusters for ph. If your res is aerated or equivalent you will be fine as long as you keep up with ph.

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Okay. I aerate water in a bucket for 24 hours. Add jacks and molasses and water the girls immediately. Growing in coco and perlite.