I wonder what kind of water needle you are talking about. We have been using a therapeutic instrument (quasi-famous brand, special for medical institutions, and now many big hospitals have this instrument) to put two electric tablets in two basins filled with water, and then put our feet in two basins, which is generally like treating lumbar disc herniation and foot pain ... This kind of acupuncture is developed on the basis of previous silver needle acupuncture, belonging to pulse acupuncture, which has better effect than silver needle, and has no side effects.