"So a 50 pound bag covers somewhere between 5,000 and 2,500 square feet. With synthetics the same coverage would weigh about 10 pounds.....
For those of you concerned about the cost, it is not more expensive to apply organic materials."
For A DIY consumer, cost is perhaps similar for organics and synthetics. However, as anyone in business can recognize, it is a lot more expensive to use an organic program. Cannot transport 5x the bulk for the same cost, can't store 5x the bulk for the same cost. And sure as heck can't get it spread at the same cost!
Labor cost to spread 5 tons instead of one ton would be quite a dramatic increase, and a man is not going to be able to cover a daily route that can be done with synthetics.