HiSiaddi is an innovative foreign trade service provider driven by both technology transformation and foreign trade operations. We have established a service system defined as "1+2+3+4=1" and can supply original high-purity phosphorus-free RO antiscalants from multiple well-known brands. As a technology-driven foreign trade enterprise, HiSiaddi has maintained close cooperation with manufacturers on technology conversion and accurately captured market demands, repeatedly solving customized product requirements for high-purity phosphorus-free RO antiscalants. Below is a case study of how HiSiaddi fulfilled customized demands for high-purity phosphorus-free RO antiscalants.
Please contact HiSiaddi customer service if you need further customized service support.
The buyer is PURE NORDIC, a pure water technology company based in Stockholm, Sweden. The company specializes in integrated reverse osmosis (RO) pure water systems for semiconductors, biopharmaceuticals and high-end laboratories. Its products and chemicals comply with EU REACH regulation, Swedish environmental protection laws and USP pharmacopoeia standards, with full compliance requirements for zero phosphorus, low TOC, low metal ions and biological inertness. It ranks among top mid-to-high-end clients in the pure water industry.
The client places an annual customized order of 28 tons of high-purity phosphorus-free RO antiscalants for their two-stage RO + EDI ultrapure water production lines. Previously, they long imported European and American chemicals but switched to Chinese sourcing due to long delivery cycles and excessive costs. Conventional domestic phosphorus-free antiscalants suffer from high impurity levels, insufficient salt tolerance and residual adhesion on membrane surfaces. Most manufacturers only supply standardized products and cannot meet their stringent customized specifications. The client entrusted HiSiaddi with full responsibility for product customization, process optimization, testing implementation and delivery.
The client specified clear requirements: total phosphorus content of the product ＜0.01% (virtually phosphorus-free), total organic carbon (TOC) ＜500mg/L, total heavy metals including iron, copper and lead ＜1mg/kg. Conventional domestic phosphorus-free antiscalants generally have TOC above 800mg/L and excessive heavy metals, making them unsuitable for ultrapure water systems in pharmaceutical and semiconductor industries.
Inlet water salinity fluctuates widely on-site (2000~4500μS/cm). Conventional products experience rapid scaling inhibition efficiency decline under high-salt conditions, with prominent calcium carbonate and calcium sulfate scaling tendencies. The customized product must maintain a scaling inhibition rate ≥96% during 30 consecutive days of operation under high-salt working conditions.
The chemical will remain in long-term contact with polyamide RO membranes. It must leave no surface residues, induce no membrane fouling and cause no membrane flux variation. Ordinary formulations contain certain high-molecular additives that lead to organic contamination on membrane surfaces after long-term use, resulting in declining product water quality.
Winter temperatures in Nordic storage warehouses can drop to -8°C. Conventional products easily turn turbid, delaminate and precipitate active ingredients under low temperatures, with irreversible performance degradation after thawing, preventing stable year-round storage.
Key indicator deviation between different batches must be ≤0.2%. A full set of EU compliance documents and biological toxicity test reports are mandatory. Ordinary manufacturers feature low automation levels leading to large batch fluctuations and incomplete compliance documentation.
HiSiaddi assembled a special team consisting of formula R&D specialists, application testing engineers, production control supervisors and compliance service experts. We collaborated with domestic manufacturers qualified for electronic-grade pure water chemical customization and completed the full process of sample development, third-party testing and mass production delivery within 25 days across five dimensions: formula R&D, raw material selection, process upgrading, application commissioning and compliance support.
We abandoned industrial-grade raw materials and exclusively adopted electronic-grade high-purity monomers, compounded with eco-friendly polycarboxylate and organic sulfonate scaling inhibition components. No phosphorus-containing additives were used at any stage, achieving undetectable total phosphorus at the formula source. We optimized component ratios to strengthen chelation and lattice distortion capabilities for calcium, magnesium and sulfate ions, boosting scaling inhibition performance under high-salt conditions.
Multi-stage precision filtration and ultrafiltration purification processes were added to production to intercept macromolecular impurities and trace heavy metal ions. The final product achieves TOC at 420mg/L and total heavy metals at 0.7mg/kg, fully exceeding client standards. Eco-friendly low-temperature antifreeze components were compounded to optimize molecular miscibility. Testing confirmed the product remains uniform and transparent with no delamination or precipitation after 20 days of static storage at -8°C.
High-viscosity high-molecular additives prone to membrane adsorption were eliminated, replaced with low-adsorption surface active components. Multiple groups of dynamic RO membrane simulation tests were conducted. After optimization, the membrane flux attenuation rate of the chemical under continuous operation is less than 1%, with no organic residues or biological adhesion on membrane surfaces, fully meeting long-term usage requirements for polyamide reverse osmosis membranes.
A fully automated continuous DCS production line was deployed with exclusive production SOPs. Real-time monitoring was implemented for reaction temperature, feeding ratios, stirring speed and discharge indicators, strictly controlling batch key indicator deviation within 0.2%. Full in-house inspection and third-party sampling testing are performed before delivery of each batch, with complete test reports issued.
10kg customized samples were first produced and sent to the client laboratory together with full test reports, membrane compatibility test reports and biological toxicity reports. All physical and chemical indicators and simulated working condition operation tests conducted by the client passed fully. HiSiaddi simultaneously provided on-site dosing plans, dosing point recommendations and daily water quality monitoring standards to guide standardized operation by maintenance personnel.
Food-grade high-purity HDPE sealed barrels were adopted, with multi-lingual labels produced in accordance with EU CLP regulations, including traceability codes and hazard warnings. We compiled a full set of documents including REACH registration files, SVHC screening reports, biological toxicity tests and USP compliance statements to satisfy EU and Swedish local import review requirements.
After mass-produced products were put into on-site service, the scaling inhibition rate remained stably above 96% under fluctuating high and low salinity conditions. RO membrane flux stayed normal, and product water quality consistently met ultrapure water standards. No abnormalities occurred during low-temperature winter storage, delivering stable year-round performance.
Membrane fouling caused by chemical residues was completely resolved, doubling the membrane cleaning cycle and significantly reducing equipment operation and maintenance costs, aligning with the client’s demand for long-term stable operation of high-end pure water systems.
The complete document set successfully passed Swedish customs and internal client compliance reviews. The 28-ton annual order was delivered in separate batches without any compliance objections.
The client highly recognized HiSiaddi’s customized R&D capacity, technical service and fulfillment reliability. Beyond completing the annual procurement plan, they fully entrusted HiSiaddi with customization and procurement of a full range of high-end pure water chemicals including EDI protectants and membrane cleaners. Both parties jointly developed a new generation of low-emission pure water chemicals to jointly expand the Nordic semiconductor and biopharmaceutical market.
Client Technical Director Comment: "We approached multiple suppliers but none could fulfill our customized requirements. HiSiaddi accurately grasped our core demands for high purity, zero phosphorus and membrane compatibility. The delivered product performance exceeded expectations, resolving technical challenges while effectively cutting procurement costs. They are a trustworthy technology-focused partner."
Overseas mid-to-high-end pure water industry clients purchasing phosphorus-free RO antiscalants center their core demands on five aspects: ultra-high purity, working condition adaptability, membrane safety, weather resistance and compliance. Standardized products cannot match high-end scenarios such as semiconductors and biopharmaceuticals.
Leveraging integrated capabilities covering formula R&D, process upgrading, full-process quality control and compliance support, HiSiaddi tailors products to clients’ personalized indicators and on-site working conditions with full-chain quality control over raw materials, production, application and compliance. For overseas mid-to-high-end clients, selecting a foreign trade service provider equipped with customized R&D, on-site technical support and international compliance services is critical to breaking technical barriers and ensuring safe, stable and long-term operation of high-end water treatment systems.
Please contact HiSiaddi customer service for further customized service support.
+86-13120989737 
info@hisiaddi.com 
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