Flushing & Disinfection
Specialized chemical cleaning and high-velocity flushing services to eliminate biofilms, sediment, and harmful bacteria from your building's water systems.
Service Overview
At Greensurv, we provide professional water flushing and disinfection services to ensure your pipework remains hygienic and safe for use. Over time, internal water systems can accumulate scale, sediment, and "biofilm"—a slimy layer that acts as a breeding ground for Legionella and other waterborne pathogens. Whether you are commissioning a new building, re-opening a site after a long closure, or responding to a failed water sample, a thorough disinfection is essential. We use industry-standard chemicals and high-pressure flushing techniques that comply with BS 8558 and HSG274 guidelines. Our service ensures that your water system is completely purged of contaminants, providing a clean slate for your water safety management plan and protecting the health of all building occupants.
System-Wide Chemical Disinfection (Chlorination)
This process involves introducing a controlled concentration of disinfecting chemicals, typically chlorine, throughout the entire water network to kill bacteria and break down organic matter.
Injecting high-strength chlorine into the system and allowing it to "soak" for the required contact time to ensure total sterilization.
Using specialized chemicals that penetrate the tough outer layer of biofilms that standard water pressure cannot remove.
Manually scrubbing and chemically treating water storage tanks to remove sludge and rust.
Ensuring all chemicals are safely neutralized and flushed out before the system is returned to service.
Taking post-disinfection samples to prove that the system is now 100% safe and bacteria-free.
Systematic High-Velocity Flushing
Flushing is the physical process of moving water at high speeds to clear out stagnant pockets and debris. At Greensurv, we implement a structured flushing regime that targets "dead legs" and low-use areas where bacteria are most likely to settle.
Clearing out construction debris, flux residues, and scale that can damage valves and clog outlets.
Implementing a managed flushing routine for buildings with low occupancy to keep water fresh and oxygenated.
Specifically targeting redundant or rarely used sections of pipework to prevent localized bacterial growth.
Flushing the system until the required hot and cold water temperatures are achieved at every outlet.
Providing a detailed record of every flushing event for your compliance file and fire safety audit.
Key Benefits
Rapid Bacteria Elimination
Effectively kills Legionella, E. coli, and Pseudomonas, reducing the risk of waterborne diseases.
Safe Site Re-opening
Essential for buildings that have been empty (e.g., after holidays or renovations) to prevent "stagnant water syndrome."
New Build Compliance
Meets the mandatory requirements for pre-commissioning cleaning of new domestic water systems.
Improved Water Quality
Removes tastes, odors, and discoloration caused by internal pipe corrosion or sediment buildup.
Our Process
STEP 01
System Survey & Risk Assessment
We identify the volume of your water system at Greensurv and determine the correct chemical dosage required for a safe disinfection.
STEP 02
Chemical Injection & Distribution
The system is dosed, and we test the chemical levels at every single tap to ensure the disinfectant has reached every corner of the building.
STEP 03
Contact Time & Monitoring
The chemicals are left in the system for a specified period (usually 1–2 hours), during which we monitor concentration levels to ensure efficacy.
STEP 04
Final Flush & Testing
The system is flushed with fresh water until the chemicals are gone. We then issue a Certificate of Disinfection for your legal records.
Frequently Asked Questions
When is a system disinfection legally required?
It is required for new installations, after major alterations, if the system has been stagnant for weeks, or if a Legionella risk assessment identifies a high risk.
Is the water safe to use during the disinfection?
No. During the chemical soak, we place "Do Not Use" signage on all taps and outlets to ensure no one accidentally consumes or uses the chlorinated water.
Will the chemicals damage my pipes?
No. We use carefully measured concentrations and neutralization techniques that are tough on bacteria but safe for all standard UK plumbing materials.
How long does the process take?
Most standard commercial buildings can be disinfected within a single day, depending on the number of outlets and the size of the storage tanks.
What is a "Certificate of Disinfection"?
This is a legal document issued by Greensurv that proves your water system has been professionally cleaned according to British Standards (BS 8558).