Membrane Care

1. Reverse Osmosis (RO) Plant Cleaning & Service

Over time, RO membranes suffer from scaling (calcium carbonate, silica), bio-fouling, and colloidal silting, leading to decreased permeate flow, high feed pressure, and elevated TDS levels. Our certified water technicians restore original membrane efficiency with customized on-site servicing:

Clean-In-Place (CIP) Chemical Flushing: High-efficiency two-stage low-pH acid CIP (for carbonate & iron scaling removal) and high-pH alkaline CIP (for organic matter, biofilm, and colloidal silt removal) using specialized membrane cleaners.
RO Membrane Replacement: Supplying and installing genuine 4040 and 8040 industrial membranes (DOW Filmtec, Hydranautics, Toray, Vontron) with salt rejection rates up to 99.7%.
High-Pressure Pump Servicing: Seal replacement, impeller overhaul, and mechanical alignment for vertical multistage centrifugal pumps (Grundfos, CNP, EBARA).
Antiscalant Dosing Calibration & Pre-treatment Optimization: Ensuring zero scale deposition on membrane surfaces and maximizing water recovery up to 75%.

Sand Filter Service and Media Replacement Sri Lanka

Filtration Service

2. Sand Filter & Multimedia Filter Service

Pressure sand filters (PSF) and multimedia filters accumulate channeling cracks, mud-balling, and biological slime over years of operation, resulting in high differential pressure and cloudy filtrate.

Filter Media Evacuation & Complete Re-bedding: Safe vacuum removal of exhausted media, vessel disinfection, and re-bedding with virgin washed & graded quartz gravel, coarse silex, silica sand (effective size 0.45 - 0.55 mm), and imported anthracite.
Internal Lateral & Distribution Nozzle Inspection: Replacement of broken bottom hub-and-lateral strainers and top diffuser heads to prevent sand leakage into distribution lines.
Multiport Valve Servicing: Overhauling manual and automatic Runxin/Clack multiport valves, replacing worn rotor seals, O-rings, and recalibrating backwash cycle timing.

Carbon Filter Service and Activated Carbon Replacement Sri Lanka

Adsorption Care

3. Activated Carbon Filter (ACF) Service

Activated carbon beds become saturated with free chlorine, volatile organic compounds (VOCs), unpleasant tastes, odors, and colorants. Once saturated, they can become breeding grounds for bacteria if not serviced promptly.

Activated Carbon Replacement: Supplying premium steam-activated coconut shell granular activated carbon (GAC) with high iodine numbers (900 - 1100 mg/g) and low attrition rates.
Steam & Chemical Sanitization: Sanitizing vessel interior walls and underdrain systems to eliminate microbiological contamination.
Free Chlorine Breakthrough Testing: On-site DPD colorimetric testing ensuring 100% free chlorine elimination before RO membranes or drinking water supply lines.

Softener Plant Service and Resin Replacement Sri Lanka

Ion Exchange

4. Water Softening Plant & DM Plant Service

Water softeners protect expensive steam boilers, cooling towers, and commercial laundry equipment against destructive limescale. When softeners fail, hard water immediately causes boiler tube burnout and immense energy losses.

Cation Resin Replacement & Re-bedding: Removing degraded, iron-fouled, or chlorine-oxidized resin and re-bedding with high-capacity gel/macroporous Strong Acid Cation (SAC) resin (Na+ form, capacity ≥ 2.0 eq/L).
Brine System Overhaul: Cleaning salt brine storage tanks, repairing brine suction venturi injectors, replacing brine valve safety floats, and optimizing salt consumption ratios.
Demineralization (DM) Plant Servicing: Strong base anion (SBA) resin replacement, acid/caustic regenerant chemical line servicing, and conductivity meter recalibration to guarantee ultrapure water < 1 µS/cm.

UF Plant Service and Ultrafiltration Maintenance Sri Lanka

Membrane Filtration

5. Ultrafiltration (UF) Plant Service

Hollow-fiber Ultrafiltration (0.01 micron) modules provide physical pathogen and colloid barrier protection. Regular servicing maintains membrane integrity and preserves low Transmembrane Pressure (TMP).

Chemically Enhanced Backwash (CEB) Flushing: Specialized chemical cleaning using sodium hypochlorite (NaOCl) and citric acid solutions to dissolve organic fouling and mineral scales.
Pressure Decay Integrity Testing: Pinpoint detection of compromised hollow fibers and mechanical fiber pin-plugging to maintain 100% bacteria and virus rejection.
UF Module Replacement: Supplying pressurized and submerged PVDF hollow fiber modules for RO pre-treatment, surface water purification, and tertiary wastewater recycling.

Complete Water & Wastewater Plant Renovation & Retrofitting

Do you have an existing Wastewater Treatment Plant (WWTP), Sewage Treatment Plant (STP), or Water Softening System that has ceased functioning, smells, or has received a non-compliance notice from the Central Environmental Authority (CEA)? Water Lanka Services specializes in complete plant renovation:

Civil Tank Rehabilitation

Repairing structural concrete cracks, sludge de-silting, epoxy waterproofing, repairing aeration tank baffles, and rebuilding damaged clarifier weirs.

Electro-Mechanical Upgrades

Replacing broken blowers with high-efficiency Roots blowers, replacing clogged diffusers with EPDM membrane discs, rewiring control panels, and installing automatic float switches.

Bio-Culture Re-Seeding

Re-inoculating dead biological reactors with concentrated aerobic and anaerobic bio-culture, establishing healthy MLSS (Mixed Liquor Suspended Solids), and eliminating plant odors.

Preventive Maintenance & Servicing Scope

Service Category	Target Equipment	Recommended Service Frequency	Standard Service Deliverables
RO Plant Service	Commercial & Industrial RO Systems	Every 3 to 6 Months	Acid/Alkali CIP cleaning, pre-filter replacement, pump pressure check, TDS calibration
Sand / Multimedia Filter	FRP & Mild Steel Pressure Vessels	Media Change every 2-3 Years	Exhausted media dump, vessel wash, underdrain check, virgin silica sand & gravel re-bedding
Carbon Filter Service	FRP Carbon Vessels (0844 - 4872)	Media Change every 1-2 Years	Exhausted carbon evacuation, steam wash, high iodine coconut shell activated carbon re-bedding
Softener Plant Service	Boiler & Industrial Water Softeners	Resin Change every 3-5 Years	Cation resin re-bedding, brine tank descaling, injector nozzle cleaning, hardness testing
UF Plant Service	PVDF Hollow Fiber Modules	Every 2 to 4 Months	Chemically enhanced backwash (CEB), citric/hypochlorite CIP, pressure decay test
Annual Maintenance Contract (AMC)	Complete STP / WWTP / WTP Plants	Monthly / Bi-Monthly Routine Visits	Comprehensive chemical, mechanical, electrical inspection, sludge monitoring, operator training

How do I know if my RO membranes need chemical CIP cleaning?

You should clean your RO membranes when permeate flow drops by 10-15%, feed pressure increases by 15%, or permeate water TDS increases noticeably. Delaying cleaning can lead to permanent irreversible membrane scaling and premature replacement costs.

How frequently should sand filter and carbon filter media be replaced in Sri Lanka?

In typical Sri Lankan industrial environments, activated carbon media should be replaced every 12 to 18 months due to organic and chlorine saturation. Sand filter media should be re-bedded every 2 to 3 years to eliminate channel bypass and crushed fine grains.

Does Water Lanka offer emergency plant breakdown services in Sri Lanka?

Yes. We provide islandwide emergency servicing for industrial wastewater treatment plants, boiler feed water softeners, and commercial RO plants across Gampaha, Colombo, Biyagama, Katunayake, and other industrial regions. Call our hotline at 076-459-1234 or WhatsApp us for priority dispatch.

Water Treatment Plant Service, Renovation & Maintenance in Sri Lanka