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If you are talking about the left over mixed up fertilizer that you did not full use after making it into a feeding solution, it is good until it starts to change, this could be colour, smell or forming precipitate. Things will grow in the water and change it like algae or fungus like yeasts and molds. Good rule of thumb use it within a weeks time. If you are talking about the bulk concentrated bottles your dilute into bigger jugs of water, its good for years. Ideally 2-5 max unless its a dry powder being reconstituted. If your talking about collected runoff from watering your plants and wondering about that, I'd day a few days. However it's not best to use that stuff unless its outdoors. Can contain a lot of excess salts. Best Of Luck & Happy Growing! ***disclaimer, multiple people are answering all questions as there is a contest called GOTM, when a user is selected as the answer they get a point. Please see the contest page for information regarding the details: growdiaries.com/giveaways/GotM-August-2022 Please note, when you reply to anything on the questions part of Growdiaries website, no one will be notified of this. Not even if you use a "@" tag in their name. Best to reach out to them in DM using your inbox, it can be found in the bottom right hand corner of the site. It's the small paper airplane button, it will be highlighted green if you have new messages***

You're feeding your autoflowers far too early in their life. They normally don't need ANY nutrients until they're 2 or 3 weeks old so I would advise you to stop feeding them and just give them plain pH'd water for another week or two. Then, when you start giving them nutrients, start them slowly with only 1/4-1/2 strength, increasing the dosage if the plants look like they're tolerating them. Also be aware that each plant MAY react differently than the any of the others - you'll have to treat them all as individuals. Good luck!

You've got a calcium deficiency probably caused by a lockout ... and just giving them calmag, as you are doing, will not fix the problem - you have to fix the cause. When you have a lockout, the plant is unable to absorb any calcium no matter how much you give it.... There are two avenues of approach here - you could simply give the plant nothing but pH'd water for a week or so and then when you reintroduce the nutes cut back on the Micro (it has heavy nitrogen in it - in fact, the NPK of it is 4-0-0 so it's almost ALL nitrogen)... OR you can flush your plants with 3X the pot volume of pH'd water adding in 1/2 strength nutes to the final gallon but cutting the Micro out completely. I would choose the last option myself - it's a pain in the neck but you want to get rid of the excess nutes and any built up salts that have accumulated in the soil... AND you don't want to waste time because autoflowers have a very short life span... The culprit here is the Micro - you can choose to either reduce the amount by at LEAST half or get rid of it altogether... plants in flower need a little nitrogen but not a lot.. and Micro has a lot... Good luck!

In your last question on this same issue, I suggested two steps you could take to correct the calcium deficiency... I think, looking at your diary, that you decided to take a middle-road approach and you reduced pretty much all of your nutrients but only a little. Now it's time for a full flush - you need to get those nitrogen-heavy nutrients out of the soil along with any build up of salts as this is what is causing the lockout of calcium. You will need to run 21 gallons of pH'd water through each plant - 3x the pot's volume - and then let them dry out before giving them nutes again. When you give them nutes, give them NO Micro at all, and about 1ml/l of the Grow and Bloom and 1/2ml/l of calmag ... for the first feeding after your flush, just ignore the other additives - you can pick them back up when you feed the second time. After flushing and their first feed, you can increase the Bloom nutes to normal strength but now leave the Grow nutes at 1/2 strength and, if you feel you MUST use the Micro, do not exceed 1/4 strength... it is THAT nute which is giving your plants excess nitrogen and causing these problems. Finally, when you give calmag as a normal part of your nute program, only give it once a week... I know running 21 gallons of pH'd water through your pots is an awful lot and it's going to be time consuming - but it really DOES need to be done now... Good luck!