Problem:

We have recently seen some cases where liquid fertilizers containing phosphorus have caused some clogging problems in the Cyberject model C2G and C3G fertigation systems.

Cause:

This is due to the fact that the Cyberject mixes the fertilizer with water prior to injecting it. In some neutral phosphorus based products, and in areas where there is significant calcium in the water, the phosphorus can react with the calcium and form calcium phosphate scale. This scale can build up in the throat of the venturi which changes its shape and causes the venturi to stop drawing. This problem will generally be seen as an MFS failure on the display of the Cyberject.

Resolution:

Prior to using any fertilizer with the Cyberject, you should verify its compatibility with your water chemistry. In the case of phosphorus based fertilizer, we recommend either not using these products, or possibly changing to an acidic source such as phosphoric acid. Using the acidic products usually causes the pH in the throat of the venturi to be low enough that scale formation is not possible.

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Last modified: April 15, 2004