Northern tool sells a decent wet blasting kit for $75.00 or so. I use it on a 3500psi power washer and it works great.
You can use play sand, but you have to filter the sand prior to use through a screen. I use the same screen material used in window screens. Bungee strap the screen around your five gallon bucket, and pour the sand in. Cheaper sand tends to have an occasional rock in it that will plug your blasting nozzle. Expensive sand can have the same rock issue, so I filter all my sand. The fabricated media such as glass or black beauty seems not to have the larger particle problem.
Conall
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