Three weeks ago, I received the product and give in each of our rooms wells every 10 days a small splash of the agent. Since then I do not need canister with distilled water to buy more, but now use normal tap water. Limescale are quite declined, new deposits I can not determine. Likewise, the growth of algae seems no longer be determined, so that the distances of but partially consuming cleaning of wells, pumps and stones can be extremely enlarged. We are very happy with the product.