What are polyphosphates?
Polyphosphates are water treatment chemicals used to solve specific water quality problems resulting from inorganic contaminants (iron, manganese, calcium, etc.) in ground water supplies and also to maintain water quality (inhibit corrosion, scale, biofilm, reduce lead and copper levels) in the distribution system. Polyphosphates are used in water treatment along with many different phosphate compounds that exist for use in the water treatment process. Polyphosphates work together, stabilizing water quality and minimizing color, scale, deposits, corrosion, and chlorine demand in drinking water systems.
What are the problems that polyphosphates help to solve?
Polyphosphates are used in residential water systems to perform three broad functions: inhibit corrosion of plumbing and plumbing fixtures and sequester nuisance metals in the water supply (iron, manganese, calcium, magnesium). They can also improve the quality of water in the home by removing scale deposits & tuberculation, discourage microbial film formation/regrowth, and stabilizing free chlorine municipal water treatment disinfectant residuals.
How do polyphosphates work in a water system?
Polyphosphate type chemicals react with soluble metals (iron, manganese, calcium, magnesium, etc.) by sequestering (bind‐up) the metals to maintain their solubility in water. The polyphosphate sequestering process minimizes the risk of discoloration, staining, scaling, taste/odor and other water quality complaints.
Are polyphosphates safe and approved for water systems?
Various forms and purity grades of polyphosphates exist. All polyphosphate additives to Buffalo Grove’s municipal water are certified to ANSI/NSF Standard #60 Drinking Water Treatment Chemicals as approved for use in potable drinking water. The polyphosphates are included in the water at very low levels. In fact, most concentrations are well below those allowable in foods when utilized as thickeners, stabilizing agents, and emulsifiers.
What other benefits of polyphosphate treatment exist?
Polyphosphates easily adapt to any pre‐existing water quality without changing the water chemistry. Referred to sequestrates, polyphosphates have a selective function, yet wide range of performance. Primary treatment benefits include: corrosion control, lead/copper control, sequestration of iron/manganese, control of calcium carbonate scale, and water softening, etc.