Originally Posted by dongle69
The 16oz instructions say 1 cupful for 100 gallons.
I've been using the regular Pond Protector (The concentrate is the same stuff though) diluted 1:10. With this dilution I still haven't finished off my first bottle after a year. I'm watching to see if it goes bad.
According to what I’ve read the shelf life for liquid bacterial products is approximately 2 years in an unopened container, 1 year after being opened if stored properly. Usually if it is pinkish or brownish in color, it should be alright. It is definitely bad if it is whitish-grey and has a burnt rubber smell.
Reading up I've found that dry enzyme products probably have an extended shelf life well beyond what is usually stated on the label. The dry formulations consist of multiple strains of spore forming microorganisms and these microorganisms can stay in the spore form (dormant state) for an indefinite period of time when properly stored.
The next time around I'll go dry and see how that works.