I am planning to install irrigation for my house. I am can use anti siphon valves but prefer to use inline valves with some variety of backflow preventer. Questions:
1. If all my sprinkler, emitters etc are 6" below the level of backflow preventer, I can get away with using Pressure Vacuum Breaker. Is that true?
2. I would like it if I can run low pressure tubes to my 2nd floor balcony. By doing so, does it mean that neither anti siphon valves or pressure vacuum breakers would be sufficient? And I need something expensive like Reduced Pressure Type Backflow Preventer or a Double Check Type Backflow Preventer?
Thanks for reading and any help would be appreciated.