Pond system siphoning
Hello,
I have a pond and a sloping front yard. I believe the sprinkler heads at the lowest point of the yard are below the level of the pond. That part of the yard is always wet. I can see water trickling out of the heads when the whole system is off. The only way to stop the trickle is to pull the pick-up hose off the pump. I can hear air getting sucked into the system and the water stops leaking out.
I've talked to the system installer and they've been out twice to clean out the valves. That works for a little while, but then the leaks come right back.
Seems like there should be some kind of anti-siphon device on this thing, but I don't know what kind or where it should be located, etc.
Any help would be greatly appreciated.
Thanks