For short-term watering over a few days, especially in summer, the Blumat with bottle adapter is suitable for drawing water from a standard plastic water bottle. The bottle provides a water reserve above the ceramic cone, with varying amounts depending on the bottle size, allowing water to be slowly but continuously pressed through the porous wall to gradually distribute in the soil. The water from the bottle can make summer watering tasks easier. This simple system is designed for automatic short-term irrigation of plants on balconies and terraces, facilitating watering during periods of high demand. It fits almost all commercially available plastic bottles from 0.25 to 2.0 liters. Output: approximately 0.3 liters per day. Comes in a pack of 2.