The additive for bedroom balcony-terraces fountain keeps its promises. We use it for about 4 weeks for our balcony fountain. This is a day about 12 hours in operation and is in the blazing sun. (South side) So far, we have noticed no water clouding or calcium deposits. The usual o.genannten fountains run with about 2 liters of water. In these cases, some splashes of means suffice as Zusatz.Ist it necessary to top up water, suffice as a few splashes of the agent. We can recommend the remedy in any case, otherwise we would have to use distilled water.