Example: Adding 100 tons of soda ash to water to make a 25% solution by weight requires about 85,000 gallons of tankage. Soda Ash Slurry An alternative toPerfect volume tankage is a slurry storage system that consists of a tank, a device for slurrying the dry bulk soda ash and transferring it to the storage tank (slurrifier), and a method for reclaiming the solution from the common tank.