It is difficult to predict the formation of these crystals. However, crystals appear to form most often in lagoons that are highly concentrated or overloaded with manure. The causes of crystallization. The crystals result from concentrations of magnesium, ammonium and phosphate ions in anaerobic lagoon water. These ions form the magnesium ammonium phosphate crystalline complex.
Crystals form most quickly on metal components.
Steel, cast iron, bronze and brass appear to be equally susceptible. Although deposition in plastic pipes has been observed in several cases, plastic components are not as susceptible. The crystals usually begin to form on some grit or other solid material lodged in the pipe. After the initial formation, the crystals build upon themselves quite readily. The deposit accumulates both along the length of the pipe and across the diameter of the pipe.