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Old March 11, 2017   #18
Nematode
Tomatovillian™
 
Join Date: May 2012
Location: massachusetts
Posts: 1,525
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I would start with the pump you have.
Just get rid of the pressure switch and air tank.
Power the pump ONLY when a valve is open.
This will require a contactor that closes and powers the pump when any of the valves are open. Irrigation controllers usually have a signal output for this.
Not sure what your controller is.


Do not dead head the pump or power it against a closed output. Bad things happen.
You can use a pressure relief valve plumbed back to the tank to prevent this problem.
Set it at 40 psi and use it as your pressure regulator.

If the cast iron pumps arent holding up to the chemicals there are reasonable stainless models available.
Bur cam 506518SS looks ok
True value and amazon has these. About $200
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