This may be a no-brainer question, but so far I haven't figured it out. Since I winterized myself (compressed air method), I'd like to test everything out before our first trip. Problem is, I'm not...
To be honest, I don't know a ton about it. I believe it is supplied by irrigation canals, but in any case it is cheaper and intended for lawn care and such. As such, it's pretty dirty. My last house, it was constantly clogging my sprinklers. The city turns on and off the supply at certain times each year.