How does a closed water system work?

How does a closed water system work? And treatments needed.

by | Aug 19, 2020 | Blog | 0 comments

A closed water system is where water is used either as a coolant or for heating. Where it is needed as a coolant, water is sealed into the system where it is chilled. It is then circulated and absorbs heat, before returning to the coolant tank where it is chilled again before being recirculated.

There are a number of advantages of a closed water system over an open one, including a reduction in the amount of water needed and a reduction in the amount of waste water – saving money on bills as well as saving a valuable resource.

A new closed water system must be thoroughly cleaned before being put into use as it will inevitably contain contaminants from building debris which could cause blockages.

A closed system will need monitoring and regular testing to help you detect any elements that could have an adverse effect on performance and reliability. This includes scale or corrosion, as well as the build-up of sludge which can cause low flow rates and provide breeding places for bioparticles such as the legionella bacteria.


Closed system testing


We recommend that closed system testing needs to take place every three months. Testing will take a maximum of an hour and the results will enable us to identify if any action needs to be taken to ensure your system works safely and efficiently. It will help to avoid the build-up of problems that could result in expensive repairs, and it will elongate the useful life of your system.


What does treatment involve?


Treatment of a closed water system may involve flushing out the current water enclosed within the system. The system will then be thoroughly cleaned and dosed with chemical inhibitors and biocides where a need for them is indicated by the close system analysis. We can subsequently take water samples which will enable us to make sure the treatment has been successful.

If you would like us to test your closed system – whether it is for industrial or domestic heating or cooling system – please contact us for a quote.

Legionella and Water Hygiene Blog Posts

We want to help you comply!