Park- and recreation-grade is the sand that is used to kill weeds on brick driveways. The grade also may be found along paths and in sandboxes. It provides sufficient weight not to be wind-dispersed and drainage not to clump and waterlog.
The safest deicer for brick driveways is one pound of magnesium chloride. This is mixed with one pound sand in a bucket and is used to cover 4 square yards of brick driveway.
NO
Boiling water, herbicide, locking sand, removal, salt, solarization and vinegar are ways to kill weeds in interlock. The situation in question describes the small spaces between cracks, driveways or railroad ties. Removal by gloved hand or mechanical means may be lower in performance and priority since it can be difficult to extract all the below-ground parts that then can grow replacements.
A brick of sand be used
plaster sand
sand stone/brick
Salt may need to separated from sand so the sand can be used to make mortar for construction applications (like a brick wall). Salt in sand will "kill" the strength and resilience of brick or block mortar, and no one with any sense will use sand with salt in it to mix up cement. Bad idea. There may be other reasons for separating salt from sand. And it is probably best done by "washing out" that salt. Salt will, as you probably realize, dissolve in water and sand will not. A continuous wash with fresh water will remove most all the salt hiding in the sand.
Brick Red, Sand, and Black
Brick will not break
They do kill by sucking them in the sand. people wouldn't breathe
Colored sand does not fade or bleed. It is used to reduce water evaporation and keeps weeds from growing and spreading.
I got rid of sand spur weeds by pulling them up by the roots. Since the seeds fall off easily, the plants grow in clumps. However, I found them easy to pull up. Unlike other weeds, once they were pulled up, they did not grow back. So the answer is hard work. However, it only has to be done right once unless the land gets reinfected or a seed gets left behind.