Use these ear drops for several years. It drips so 10 x drops into the ear canal and left for the whole 5-10 minutes. Then, with the ear syringe flushed some times, and nice to see again and again, what has since accumulated over time - :). This product is available in two versions: one with and one without ears syringe. So the first time you buy with ear syringe and the next time you only need then the slightly cheaper refill. But the 10 ml enough for me for a whole year.