We had 7 tons of AG lime delivered. It was fairly cheap, and let me tell you....7 tons goes a LONG way!! We put it around the bottom of the fence. When this stuff gets wet....then drys... it hardens almost like concrete. We put it in the floor of the coops....they are all on dirt/AG lime flooring. This stuff looks like a fine gravel. There is still about 3 tons of it out under the old willow....and the free range hens and roos LOVE to dust bath in it. They have all summer, and everyone seems happy and healthy. ( well, untill this heat wave...eggs are coming slower)