Best way to rid tree stumps?

Three ways really. Rent a stump grinder, which is the fastest and turns it into chips in an hour or two, but it's a heavy machine and you need to clear stones round the stump first. Dig it out, which is fine for small ones, cutting through the roots with a saw or axe as you go. Or let it rot, drill holes in the top and keep it damp, but that takes a year or more. The stump remover granules only speed up the rotting, they don't make it vanish. And check for buried cables or pipes before grinding or digging.