Although I do not install these, I have heard mostly good about these products:
Ease of fertilization.
Won't burn your lawn.
Easy maintainence. (put new tablets in once a month)
Safe.
I have heard that some clog up your sprinkler heads, but I read up on EZ-Green, and they claim that it does not.
You might want to check into how safe it is for children, I could not find anything on that.
I would think that when you blow out your sprinkler system, the air goes through the injector, so the air would blow the water out of there too.
It looks like a good product, maybe you should contact EZ-Green for more info, or visit their website.
