回复：请教草地自动喷水系统的保养问题

Yes, You have to. Here is what my family did:
turn on the water on each zone. water five minutes. then shut the water off immediatedly without tunr off the controller. repeat the procedures on each zone so the water can be drawn away from pipe.
some remainder water can be slowly leaked from pipe.
However, you will take a little risk. 六年内，我家管子就冻暴过两次。一般是我给修理方向和买材料，老公负责维修。这样做的目的是省钱。当然，每次维修都会有所改进。直到现在还在实验中。不提倡推广。
2. Here is what one of my friends did. She bought a machine from homedepot about $200. She uses the machine to draw away the water in pipe.
3. You can also hair a person to do so. it would be $50 to $70 per time in my area.