Phosphates, phosphatic and non-phosphatic silicate combinations
When unprotected steel and cast steel piping systems used for the distribution of potable water remain intact for decades, their corrosion resistance is due to well developed coatings. An important prerequisite for the formation and preservation of coatings is an adequate mass flow. This explains why rusty water is observed in network sections with a low mass flow and in terminal sections where water often stagnates.
 Section of pipe from a test system without inhibitor |
 Section of pipe from a test system with inhibitor |
METAKORIN inhibitors prevent system-endangering corrosion and the formation of rusty water in many types of water. These phenomena are usually attributable to turbulence-related corrosion processes in sections of networks with a low mass flow and in stagnation zones, but are also often caused by the uncontrolled mixing of different types of water in the water transport system and to changes of water in supply areas, when systems are converted from hard, electrolyte-rich water to soft water with a low electrolyte content. The proven active substances for reducing general corrosion in copper pipes and reducing potentially harmful lead emissions are also used centrally in waterworks.
To ensure that water consumers are convinced within days that the right measure has been taken to eliminate the problem of rusty water, we advise small and medium-sized waterworks to use the multiphase method with phosphates, phosphatic and non-phosphatic, carbonate-activated silicate combinations of the Carbosil -TWH and Carbosil -SC series.
After starting by adding only orthophosphate, the proportion of silicate is gradually increased and that of phosphate reduced, until finally the proportion of silicate in the drinking water is again increased and the phosphate – in the most favorable case – can be totally dispensed with.