Unpowered Terracotta Irrigation Controller 

It is recommended that you watch the YouTube video Terracotta Valve

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Above ground installation of the Unpowered Terracotta Irrigation Controller 

In ground installation of the Unpowered Terracotta Irrigation Controller 

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Above ground installation of the Large Unpowered Terracotta Irrigation Controller 

In ground installation of the Large Unpowered Terracotta Irrigation Controller 

Unpowered Terracotta Irrigation Controller showing float and water level

The float for the Unpowered Terracotta Irrigation Controller is adjustable

Terracotta is porous and so the water level in the pot falls as water seeps through the pot. A float inside the pot floats on the water. When the water level reaches the low level, a magnet inside the float activates the valve so that the valve opens and the irrigation starts. During the irrigation event a control dripper drips water into the pot and the water level rises. When the water level reaches the high level, the magnet inside the float disengages from the valve so that the valve closes and the irrigation stops.

The Unpowered Terracotta Irrigation Controller is suitable for automatic sprinkler irrigation or drip irrigation. The valve at the bottom of the controller operates in the pressure range 10 kPa to 800 kPa. The irrigation frequency responds automatically to the on-site prevailing weather conditions (namely, evaporation and rainfall). For in ground installation the irrigation frequency also responds to the transpiration of the plants.

During an irrigation event, the control dripper replaces the water that has seeped through the pot since the previous irrigation event. This volume is called the control volume. The Unpowered Terrcotta Irrigation Controller has a control volume between 77 ml and 333 ml. The Large Unpowered Terracotta Irrigation Controller has control volume between 400 ml and 2300 ml.

By using the Unpowered Terracotta Irrigation Controller with the appropriate control dripper, you can irrigate directly from a rainwater tank by gravity feed without using a pump. Furthermore, by using the same drippers throughout irrigation application, the volume of water discharged by each dripper is independent of the water level in the tank. The Unpowered Terracotta Irrigation Controller is a game-changer for automated gravity feed irrigation from a rainwater tank without using a pump.

Key Features

  1. Unpowered (no batteries, no solar panels, no electronics, no computers, and no WiFi)

  2. Water supply pressure 10 kPa to 800 kPa

  3. Use for sprinkler irrigation or drip irrigation

  4. Use for gravity feed or pressurised irrigation

  5. Use with PC (pressure compensating) drippers or NPC (non pressure compensating) drippers

  6. Adjust the water usage rate by adjusting the control dripper

  7. Adjust the interval between irrigation events by adjusting the float

  8. Adjusting the water usage rate does not affect the interval between irrigation events, and adjusting the interval between irrigation events does not affect the water usage rate

  9. Responds automatically to on-site evaporation and rainfall

  10. The irrigation frequency increases significantly during a heat wave

  11. Install above ground or in ground

  12. For in ground installation the controller responds automatically to plant transpiration

  13. Provided the same drippers are used throughout the irrigation application (including the control dripper), the water usage rate is independent of the water supply pressure

  14. Irrigate directly from a rainwater tank without using a pump

  15. Water in the terracotta pot is protected from algae, mosquitoes and thirsty animals

  16. Simple, unpowered, and low tech, and therefore fewer things can go wrong

  17. Leave your irrigation application unattended for months on end

Large Unpowered Terracotta Irrigation Controller showing float and water level

The float for the Large Unpowered Terracotta Irrigation Controller is adjustable

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Adjustable control dripper for the Unpowered Terracotta Irrigation Controller

The control dripper drips water into the terracotta pot

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