There should be a hose clamp that you can loosen and remove the hose. Pick up the screwdriver, clear out the grinder's exit, then pick up the hose, throw it out, or use a hanger to go through it to untangle the hardened stone. If everyone else fails to call the dentist's service center. Good luck to you.
Future PS will always run the machine after pruning, allowing the water to wash the hoses through it.
