Pond BIO Blue 5 Gallon

We've been using MicrobeLift bio-blue in our pond for years and this was the first time I found the 5-gallon jug online. Used properly there is no fish-kill, and it makes the water around our mini golf course a lovely blue. The blue also reduces algae and other herbaceous growth. I would give it a 5-star rating for product.But this 5-gallon jug is not actually marked with the capacity of 5 gallons. So our staff pond guy, thinking it was 2.5 gallons, put the entire jug in the pond at once. Our water is VERY VERY BLUE right now and we swallowed up $150 all at one time. If there was a way to mark the container, that would be an improvment.