AN sensi A&B gets smelly after few days

Bought nutes in March. Mix my a&b in 5 gal colored buckets with RO. After 3-4 days, they start to smell. They have lids( not air tight ) , in a room that never gets over 75. Not in direct light.

What am i missing? I thought i could go least 7 days before having issues.

side note - did RDWC for years and never had a rez smell, but it was constantly circulating. Do i need airstones in these buckets to keep them fresh?

Why would you ever pre mix nutes and seal them in a 5 gal to sit only mix when you need them.

I wouldn't pre mix them and leave them sit but if you do I'd recommend at least an air stone

Airwalker16 said:

Why would you ever pre mix nutes and seal them in a 5 gal to sit only mix when you need them.

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to save 10-15 min each time i feed ...when im out of town and i have a family member take care of my girls, then i know they wont fuk up mixing and feeding