The following is useful information from the Hunter website: Multiple Rotating Streams Use Less Water and Provide Healthier Growth. The revolutionary MP Rotator features a unique, multi-trajectory rotating stream delivery system that achieves water-conserving results. Rather than simply “spray” water onto landscapes, MP Rotators deliver multiple streams of water at a slow, steady rate. This slower application rate allows water to gently soak into the soil, and achieves an even distribution throughout the area being irrigated. This increased efficiency results in 30% less water use when compared to traditional sprays, and significantly reduces wasteful runoff. The MP Rotator can be installed onto any conventional spray head body or shrub adapter, transforming them into high uniformity, low precipitation rate sprinklers with matched precipitation at any arc and any radius.