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Advice on irrigation build

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SanPancho

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hey folks- long story short, ive got too many different things in the patio that need to be irrigated at different levels/amounts. from citrus and small fruits to huge bamboo stands and 6 foot avocado trees.

my issue is this- i would like to get a dual line irrigation timer so i can group the bigger trees with the bamboo. then all the small fruits together on the second line. should do much better than having them all on a single timed setting. was thinking of one of these basic units. https://www.amazon.com/dp/B00KIXY6NG?tag=bestofhomegarden-20

however- i have a fertilizer injection unit downstream of the existing timer. not exactly the same but kind of like this http://www.sprinklerwarehouse.com/EZ-FLO-Fertilizer-Tank-Assembly-p/ez001-fert-kit.htm

now i still want to have it fertilize both irrigation feeds. but i dont see a way to connect it to both without putting it upstream from the timer, like this-

main >> high point> vacuum breaker> horizontal run> injector unit> timer> two irrigation feeds.

however i dont think its supposed to be under constant pressure. and if the main is always on then the vacuum breaker wouldnt work. so i guess the only thing i could think of is to keep the existing single timer, and use it right off the main to control when the line gets water, set it for like 2 hours, and then sync the dual timer to run its loads during the time the first timer has the line open and pressurized.

main- single timer (2 hours?) - vacuum break- injector- dual timer- irrigation feeds

anybody see any issues with this setup? cant really think of any other way to prevent the backflow of irrigation with the injector before the dual timer.
 
bumping this,

any body have an idea of something more simple?
 
theoretically it is under constant pressure, but there are always drops in pressure. IMHO i wouldn't trust a vacuum breaker and use at a minimum backflow preventer. Some areas mandate you need to be mechanically separated thats even worse you need to drop your water supply into tank then pump it out. Guess just my opinion I would not hook any chem feeder to a water main stop being lazy and poisoning your neighbors.
 
I'm a big fan of metered drip and spray irrigation. You select the emitter orifice size for the amount of water per hour each plant or group needs then hook everything up to a common source, either via a single line or branching radials. Drive the whole thing through a single timer...

Cheers!
 
theoretically it is under constant pressure, but there are always drops in pressure. IMHO i wouldn't trust a vacuum breaker and use at a minimum backflow preventer. Some areas mandate you need to be mechanically separated thats even worse you need to drop your water supply into tank then pump it out. Guess just my opinion I would not hook any chem feeder to a water main stop being lazy and poisoning your neighbors.

stop being lazy and pay attention. all scenarios have vacuum break.

and to go further on the main side there are double risers built in so its impossible to back up into the supply.

but sure, go ahead and accuse me of poisoning my neighbors. classy.
 
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