How To Drain Sprinkler System Backflow. (usually located in the basement or crawl space) step 2: A sprinkler system can stop working for many reasons.
Adjust all ball valves and backflow test cocks to a 45 degree angle. All you have to do is turn off the water at the water main, clean the valve and reattach it to the lines.
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Allow all of the water to drain from the sprinkler heads. Backflow creates the potential for fertilizers, herbicides and other unwanted harmful substances to move from an irrigation system and into the public or potable water supply.