on some blast pots the plunger pots up to seal the tank,
the air psi in the tank pushes the grit to the bottom and out the mixing valve to the air running under and out to your hose.
In most soda tanks, the air line runs through the tank, at the bottom there is a finger that sits just above the bottom (this part is adjustable for grit flow) as the air goes by, it sucks the soda into the air stream and out the bottom and to the hose.
Pop up valves are good for fast fills and large volume .Pressurized pots lend themselves to more control of media being used.IE a soda pot uses 1 to 2 25lb bags an hour while the same size grit pot could use 8 100lb bags.
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