How to choose between roller brushes and double-head brushes for medium and large power stations?

Roller brushes have a cleaning efficiency similar to double-head brushes (about 350 ㎡/h, water consumption 0.4L/㎡) and are suitable for power stations of 500-6000 square meters. Roller brushes are better for dry cleaning of non-heavy stains such as dust, water scale and slight dry bird droppings, while double-head brushes are recommended if there are a lot of stubborn stains.