The Solar Rainmaker SOL-K12 waters automatically every 3 hours drawing water from customers rain barrel, bucket or any non-pressure water supply. The amount applied varies depending upon the amount of sunshine and the position of the control knob. The Solar RainMaker SOL-K12 can be set up to water large or small plants, but will always apply more water in sunnier conditions, when your plants need it most. The Solar Rainmaker SOL-K12 can supply up to 12 drippers and is suitable for beds, baskets, vegetables, pots, grow bags, specimen plants and tree establishment. The Solar Rainmaker SOL-K12 supplies enough water for 6 large hanging baskets or 12-12 pots.