The pool sand i have used does not have lumps. You Yanks can keep your lumpy pool sand.
Seriously, as others have posted, check with a local supplier of blasting media.
There are many grades of sand for use in a sandblaster, the manufacture of your machine will have a list of grades that will be suitable for use. Your blockages may be a result of moisture forming in you holding tank. What is the name and model of your blasting machine.Some of the machines i've seen have an agitator that stirs the sand as it funnels down into the feeder tube to prevent blockages.
Post some pictures of your set up
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