UN-611 RO Membrane Biocide for Food Processing in Karachi
Non-oxidising biocide for the polyamide RO trains feeding food and beverage process water in Karachi. Membrane-safe, food-contact-pretreatment cleared, stocked locally.
Karachi is Pakistan's largest food and beverage processing footprint: dairy (Engro Foods, FrieslandCampina Olper's, Nestlé Sukkur but with Karachi distribution), beverage (PepsiCo Pakistan Beverages, Coca-Cola Beverages Pakistan, Murree Brewery's malt drinks, Shezan), edible oil, baby food, fruit pulp, and a long tail of contract packers in Korangi and Port Qasim.
Process water for these sites runs through softening + carbon + RO + UV + storage. Polyamide RO membranes are chlorine-sensitive: even low-residual chlorine breakthrough degrades the active layer within weeks. So the carbon column has to remove chlorine reliably, and the biocide downstream of carbon has to be non-oxidising.
Karachi's coastal humidity plus warm process-water temperatures (often 28–32°C in storage) make biofilm regrowth fast. Without a non-oxidising biocide cycle, sites see normalised differential pressure climbing on the lead RO stages within 4–6 months; that's lost output and forced chemical cleanings.
Logistics: most food-processing sites are within 25 km of our Clifton warehouse. Same-day delivery is standard for shock-dose calls, and we keep documentation packs (CoA, SDS, REACH summary) ready for QA-led supplier qualification.
UN-611 is a non-oxidising broad-spectrum biocide engineered for polyamide composite RO membranes. Active content 20%, pH 6.5–8.5, colourless to pale-yellow liquid. Penetrates biofilm and kills the microbial colony by disrupting cell membranes; flushes out cleanly without leaving residues that affect downstream taste/odour profiles. Compatible with TFC, CPA, ESPA, and similar polyamide formats.
- Stage: dosed into the RO feed manifold downstream of the carbon column dechlorination point.
- Function: penetrates established biofilm on the membrane lead surface, kills the microbial community, frees up the surface for the next operating cycle.
- Shock dose: 25–75 ppm for 30–60 minutes, frequency 1–3× weekly depending on biofouling pressure.
- Offline preservation: 500–1,000 ppm if membranes will sit idle (planned shutdown, seasonal break in production). Drains and rinses cleanly on restart.
- Pairing: in food-grade applications, follow shock dose with a thorough flush + permeate-side conductivity check to confirm no carryover before resuming production.
Where UN-611 chemistry has run on food & beverage processing sites near Karachi.
Selected, anonymised. Site-specific case studies and references shared on supplier-qualification request.
Beverage bottling plant · Korangi · 2023
UN-611 shock dose programme on a 75 m³/h two-pass RO. Cleaning frequency reduced from monthly to quarterly; permeate microbiology stayed within QA spec.
Dairy process water · Port Qasim · 2024
Replaced an imported DBNPA biocide with UN-611 at 30% lower cost-in-use; brand-audit documentation accepted on first review.
Edible oil refinery · SITE area · 2022
UN-611 + UN-307 programme on a 120 m³/h boiler-feed RO. Membrane life on the lead-stage extended from 18 to 32 months.
Tell us your site, the loop, the symptom, the volume.
Same-business-day reply from Karachi with a programme outline and the relevant CoAs / SDS attached. Or WhatsApp the engineering line directly; same engineer who writes the dosing programme answers the message.