Limescale accumulation is a common issue in industrial and residential hot water systems, primarily caused by the crystallization and precipitation of calcium and magnesium ions upon heating. Long-term buildup not only reduces thermal efficiency and increases energy consumption but also poses safety risks such as pipeline blockages and equipment corrosion. Siliphos (polyphosphate-based) water treatment agents offer a chemical solution for scale inhibition; through a molecular-level mechanism, they effectively prevent scale formation and extend the service life of equipment.
The core component of Siliphos is polyphosphate (chemical formula: Na₂[Na₄(PO₃)₆]). Phosphate groups within its molecular structure form soluble complexes with calcium and magnesium ions present in the water. This complexation alters the crystallization morphology, transforming calcite-type crystals-which readily adhere to metal surfaces-into loose aragonite-type crystals that are easily flushed out of the system by the water flow. The product comes in the form of spherical solids (2.8 cm in diameter) with an active ingredient content of 99.9% and a stable, neutral pH of 7.0 ± 0.5. Its property of being sparingly soluble in water allows for the slow, continuous release of active ingredients, providing scale inhibition for 10–14 months after a single application.
This product is primarily used in closed-loop circulating water systems, such as air-source heat pump water heaters, boilers, and solar water heating systems. It is applied by placing the spheres into a dedicated filter housing or directly into the water tank, where they gradually dissolve at ambient temperatures. Its dual functionality-corrosion and scale inhibition-stems from two mechanisms: first, complexation reduces the concentration of free calcium and magnesium ions; second, the polyphosphate forms a protective film on metal surfaces, isolating the metal from direct contact with the water. Users should avoid mixing the product with strong oxidizing agents and should shorten the replenishment cycle if the system requires high volumes of make-up water. Compared to traditional physical scale-prevention methods (such as electromagnetic descaling) or acidic cleaning agents, the Siliphos (silicon-phosphorus crystal) solution offers three key advantages: First, its neutral formula is non-corrosive to metal piping, making it particularly suitable for materials like copper and stainless steel; second, its sustained, slow-release property prevents fluctuations in chemical concentration, ensuring long-term stability; and third, it requires no equipment downtime for retrofitting, resulting in lower installation and maintenance costs. In practical applications involving water with a hardness of 300 mg/L, the solution reduces the rate of thermal efficiency degradation in equipment by over 60% and cuts the frequency of pipeline cleaning by 75%.
The product utilizes a sparingly soluble design to control the release rate of the active agents; its solubility in water at room temperature is merely 0.02 g/100 mL, ensuring effective scale inhibition while preventing over-dosing. Its decomposition product is phosphate, which complies with the phosphate limit requirements set forth in the *Standards for Drinking Water Quality* (GB5749-2022). The product is packaged in 20 kg sealed drums; storage and transport should avoid high temperatures and humidity, and any unused granules remaining after opening must be sealed properly to prevent moisture absorption and clumping.