Our non-alkalinity-altering inhibitors (like zinc orthophosphates) maintain corrosion control without raising pH, allowing you to lower chlorine demand and minimize disinfection by-product formation.

Indicative of biofilm and dislodged scale. Our zinc polyphosphates reduce biofilm-based iron cycling and scale reformation. Over time, they stabilize iron and reduce corrosion-generated color events.

Our NSF 60-certified orthophosphate inhibitors form stable complexes with lead ions, dramatically reducing lead solubility even in low-alkalinity systems. With proper dosing, many systems see significant improvement within weeks, without needing to adjust pH.

Many “blends” on the market use generic or unstable formulations. Sterling’s products are formulated for dose stability and long-chain retention, designed for real-world distribution system behavior, not just bench chemistry.

Low-velocity areas allow iron and biofilm to accumulate, increasing corrosion potential and discolored water complaints. Our polyphosphate and ortho-poly blends inhibit iron oxidation and reduce sediment formation by keeping Fe²⁺ stabilized in solution even under stagnant conditions.

Sterling offers low-dose optimized formulations (e.g. high-purity ortho blends with film-forming additives) that remain effective at ≤0.3 mg/L PO₄. We also offer zinc-silicate hybrids for phosphate-restricted areas or systems under increased environmental scrutiny.

Our buffer-tolerant phosphate blends are effective across a wider pH range (6.5–8.5) than traditional single-agent treatments. For blending zones, we provide dose-flexible formulations that remain effective under shifting pH and temperature conditions.

This is often due to poor surface preparation or product instability. Sterling’s high-purity orthophosphate and zinc orthophosphate products promote faster, self-limiting film formation on pipe walls when dosed consistently, especially in systems where metals are in active release.

Sterling offers phosphate-only and silicate-phosphate options for zinc-restricted systems. These formulations still provide corrosion control and sequestration, especially when paired with source-specific feed tuning.

Sterling provides system evaluations, including review of historical water quality data, distribution material inventories, and corrosion indicators. From there, we recommend targeted products matched to specific corrosion mechanisms: galvanic, pitting, or underdeposit.

Likely soft-water-induced Type I corrosion. Our ortho-poly blends form protective films in low-alkalinity water without raising pH, helping prevent pinhole leaks and blue-green staining.

Sterling polyphosphates sequester Mn²⁺ and Fe²⁺, preventing oxidation and precipitation. They stabilize soluble metals through stagnant zones and revert to orthophosphates in the system for additional protection.