3. Why do I need a backflow prevention system?

That keeps anything bad (like chemicals) from drawing back from the
irrigation system into your household water supply.

The professionals around here use Toro parts. My neighbor's heads are
Nelson, but he's a gazillionaire and overpays to get industrial
strength versinos of anything he buys.

My buddy the surgeon just whipped out his checkbook and is paying
$8000 to have a system professionally installed next week.

I hope it rains every day after that.