Because it is solar-powered

Lake and pond water may be used immediately following treatment for irrigation without harm to plants or grass

The standard RA3 package comes with a fully weather proof

3-year warranty on 2 and 5HP units (optional 5 year extended warranty available)

Kasco Marine RA4 Robust-Aire Diffused Aeration System - Airline Sold Seperately Pond Fountains Because it is solar-poweredThe Kasco RA4 Aeration System is well suited to aerating larger ponds up to 4 acres in size based on a depth of 15' or greater. Less depth will reduce the coverage area. Effective aeration can be achieved in 3 acre ponds 5 to 8 feet deep, 4 to 5 acre ponds 8 to 12 feet deep, and 6 to 7 acre ponds 12 to 16+ feet deep. Please contact us if you have questions or would like a certified aerial pond mapping (no charge) to be conducted to find out if this