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It's a lot of work, but good exercise. 8-10 heads on a zone is iffy depending on water pressure. With my water pressure I could only do 7. So I ended up with 2 zones for the back lawn with 5 heads each, and a third zone doing drip for the vegetable beds and fruit trees. When I get around to it I want to do two more drip zones in the front yard which is all shrubs and flowers. Drip is really easy too. No digging required.
red-beard, all the sprinkler companies make valves with the backflow preventer built in for only a few dollars more per valve. Also put your valves above the highest point in your system, or you will have a lot of water pouring out of them when the valve shuts off.
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