What Nick Viney calculated looks correct if we can see the label correctly.

To expand on his calculations, it will take 15 gallons of the product to equal one 51 lb. bag of AMS.   What is the price comparison to dry AMS in you area using that formula? How much for a gallon of that product?

 If I can see correctly the product weighs 9.8 or 9.9 lbs. per gallon on your label.

Looks like they are mixing 850 lbs. of AMS in a 250 gallon tote.