It is a 3 day process of very slowly pumping water into the lines, and an even slower more cautious process for us due to the age of our pipe in the ground. As the water begins to fill the lines, the air is compressed, so we create many exit "relief" points as we fill. We also use heads, as in the picture above, to bleed air off the system.
It is a slow gradual process because a lot of damage and water hammer can be created if you fill the system to fast.
To me, it always signifies the start to the golf season. This is the same week that we filled the irrigation system last year. We will probably actually irrigate sooner this year because of the dry and windy spring we are having so far. I always fill the system early to detect any leaks or problems before we actually need to run irrigation, but this year I see us running as soon as the system is operational.
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