Decoder Controllers are commonly used in commercial applications. Two wires are laid in the area to be watered and solenoids are added with a decoder where necessary. The decoders have an individual address and are programmed back at the controller as normal. The 2 wire system means much less cable than conventional systems which simplifies the installation process and reduces costs Given that each decoder has an individual address it is very easy to add extra solenoids to the system.
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No, unless you’re tapping into your water supply, a plumber isn’t required. Most domestic irrigation systems can be installed by anyone half handy.
The main safety concern is regarding the water supply. To avoid contamination of the mains water upstream, in most municipalities, a Dual Check Valve is required at the water connection.
In some states a rain sensor is mandatory, but regardless it’s something you should include in your irrigation system. Having your system turn on in the middle of a day of rain is not only embarrassing, it’s a terrible waste of water & the overwatering is bad for your garden!
Even on a typical domestic system running on mains water a filter is still a good idea. In the event of a water main fault where rubbish does find it’s way down the line, a filter will protect the system from blockage and or failure. On systems operating off recycled water, like from a tank, a screen filter is mandatory. Debris like silt & dirt from recycled water is the most common cause of blockages of failures in irrigation systems.