RO antiscalant supplier in Pakistan with the matching membrane biocide.
UN-307 phosphonic-blend antiscalant for CaCO₃, CaSO₄, BaSO₄, SrSO₄, silica, and iron scales, paired with UN-611 non-oxidizing biocide for polyamide-membrane biofouling control. Both held buffer-stocked in Karachi, sourced from Shaanxi Ande Technology under our sole-agent contract. A written dosing programme ships with every order, sized to your feedwater analysis.
Five things a plant chemist should know before signing an RO chemistry contract.
Most Pakistani RO plants buy antiscalant from one vendor and biocide from another, with no coordination on dose rotation. The biocide kills the bacteria; the antiscalant holds the calcium. Both have to work together to protect a $50,000 membrane stack.
UN-307 and UN-611 on a single membrane programme.
Two chemistries, one feed point on the high-pressure pump suction (UN-307 continuous) plus one CIP-cycle add-point on the membrane housings (UN-611 shock). Both run from the same dosing skid hardware.
| Product | % active | Dose | Feed point | TDS |
|---|---|---|---|---|
| UN-307 antiscalant | 40-50% | 2 to 5 ppm on feedwater (continuous) | HP-pump suction, post-dechlorination | UN-307 |
| UN-611 biocide | 20% | 25 to 75 ppm shock, 30-60 min, 1-3× weekly | Membrane housings, CIP cycle | UN-611 |
| UN-611 (offline preservation) | 20% | 500 to 1,000 ppm soak | Membrane housings, offline storage | UN-611 |
Compatible with polyamide TFC, CPA, and ESPA membranes from Hydranautics, DuPont (FilmTec), Toray, LG Chem, and Vontron. Max feedwater LSI +2.8 on the concentrate side. Both products non-chlorine-tolerant: ensure dechlorination upstream.
An IPP in Punjab during a 90-day membrane replacement window.
The plant runs a 200 m³/hr brackish-water RO on canal feed with seasonal silica spikes to 80 ppm SiO₂. The incumbent antiscalant was Nalco PermaTreat on 8-week air-freight lead times, and the plant ran out twice during the silica-spike season. We switched to UN-307 at 3.5 ppm with 4 MT held on rolling Karachi stock, plus UN-611 weekly shock at 50 ppm. Through the 90-day membrane swap window, the chemistry held continuously and the procurement officer stopped getting middle-of-night escalation calls.
A Faisalabad textile mill switched RO chemistry on cost-in-use math.
The mill was running Buckman's antiscalant on a 120 m³/hr brackish RO at 4.2 ppm dose, cost-in-use roughly PKR 14 per m³ permeate. We re-jar-tested with UN-307 at 3.0 ppm against the same feedwater, holding the same CaCO₃ and CaSO₄ inhibition, with cost-in-use coming down to roughly PKR 9.50 per m³. The savings paid for the UN-611 biocide additions plus a quarterly applications-engineer visit. The mill normalized cleaning frequency from every 4 weeks to every 9.
A Karachi pharmaceutical plant added a biocide layer to existing antiscalant.
The plant runs municipal-feed RO for utility water with antiscalant from an existing local blender. Persistent biofouling was driving CIP frequency to once every 3 weeks, with cleaning chemistry costs running over the chemistry budget. We added UN-611 at 50 ppm shock weekly without changing the antiscalant. ATP-swab counts on membrane surfaces dropped from 800 RLU to under 50, CIP frequency stretched to 9-week intervals, total RO chemistry spend fell ~30%.
MOQ, dispatch, terms.
Three engagement shapes. Pricing is custom by product, volume, and packaging; the quote returns within 2 business days with the COA sample.
Pricing bands are not published. Each quote is sized to product, volume, INCO, and packaging. The cost-in-use comparator at /calculators/cost-in-use/ runs delivered cost against your incumbent on per-m³-permeate basis.
Buying UN-307 and UN-611 ad-hoc when the drum runs out leaves the plant exposed to three risks: lead-time gaps on reorder, dose drift between chemists, and no accountability when membrane flux declines. A programme path collapses all three: continuous chemistry supply, quarterly KPI review, dosing programme refreshed when feedwater profile shifts, single vendor when the flux number moves.
The Refinery RO programme handles the same chemistry duty with engineering wrapped around it (commissioning, ops & maintenance, sludge audit). Read the program brief if your duty is large enough to justify the structure.
RO chemistry siblings on the AAS catalogue.
UN-307 and UN-611 are the primary pair, but RO plants commonly add a clarification chemistry upstream and a corrosion-control chemistry on the carbon-steel side of the high-pressure pump.
RO chemistry procurement, what to expect.
What RO antiscalant grades do you supply in Pakistan?
UN-307 is our flagship: phosphonic-blend broad-spectrum antiscalant for CaCO₃, CaSO₄, BaSO₄, SrSO₄, silica, and iron scales. 40 to 50% active content, dosed at 2 to 5 ppm on feedwater. Approved for potable RO pretreatment when paired with appropriate dechlorination upstream. Compatible with CPA, ESPA, TFC, and polyamide membranes from all major OEMs.
Do you supply RO membrane biocide alongside the antiscalant?
Yes. UN-611 is a non-oxidizing biocide formulated for polyamide composite membranes. 20% active content, shock-dosed at 25 to 75 ppm for 30-60 minutes, 1 to 3 times weekly. Unlike chlorine and other oxidants which destroy polyamide membrane active layers, UN-611 is fully compatible with TFC and CPA membranes. Most accounts buy UN-307 and UN-611 together as a complete RO chemistry pair.
What feedwater conditions does UN-307 handle?
UN-307 holds calcium carbonate scale to LSI +2.8 on the concentrate side, which covers most brackish groundwater in Punjab and Sindh. For seawater desalination duties, the typical dose moves to 4 to 5 ppm on the feedwater. For high-silica feedwater (60+ ppm SiO₂), we adjust dose upward and may pair with an antifoulant. Submit your feedwater analysis and we return a written dosing programme.
How does cost-in-use compare to Nalco PermaTreat and Genesys?
UN-307 typically lands 20 to 30% lower delivered-PKR vs Nalco PermaTreat or Genesys equivalents when normalised on active content and dose rate. The bigger advantage on Pakistani sites is operational: Karachi stockholding means a 5 MT order ships the same week vs months on the European-imported brands. The cost-in-use calculator at /calculators/cost-in-use/ runs the math against your incumbent.
What's the MOQ?
200 kg drum for stock-spec on both UN-307 and UN-611. Trial drums of 25 to 50 kg are available on request for new accounts running pilot tests on their RO train. Program-scale tiers run 5 MT same-week ex-Karachi through 50 MT factory-direct from Shaanxi Ande on 4-week production plus 21 to 35 days sea freight CIF Karachi.
Do you provide a dosing programme with the chemistry?
Yes. Every UN-307 order includes a written dosing programme based on your feedwater analysis (LSI, S&DSI, silica, iron, hardness profile). For ongoing supply contracts, our applications engineer visits the plant on commissioning and reviews flux decline and cleaning frequency quarterly. The dose gets retuned when feedwater profile shifts (seasonal canal water, well rotation, etc.).
Can I get samples before ordering?
Yes. We send a 1 to 2 kg sample of each, plus matching COAs and TDS, at no commercial commitment. Most plant chemists run a side-stream pilot or a CIP-cycle comparison before signing. Sample dispatch is 2 to 3 working days from Karachi.
Send the feedwater analysis, get a dosing programme back.
Three minutes of intake (membrane type, flow rate, feedwater analysis if available). Rayhan's team replies with a written dosing programme, indicative quote, and the matching factory COA sample within 2 business days.
Austin Anderson Solutions · C-86, Block-2, Clifton, Karachi 75600
+92 (21) 35874214-5 · rayhan@austinandersonsolutions.com
WhatsApp 24/7: +92 300 823 9990