Shelf life of diluted Kelpac growth stimulant

[mykl]

They also have a fertilizer, so I thought I should specify - The root stimulant.
I usually use a thirty gallon pail for my dunking tank, but I suspect I will need to use a separate pail for this product; probably a twenty gallon pail.

I would rather keep a large pail rather than something I would have to pour out in the yard every week or so. (If you saw my yard, you would know why I don't want to pour a root supplement around.)

Love to know how you handle this stuff on your orchids.
as well as the longevity once diluted.
TNX