Pesticide, chlorine, taste, odour & organics
Granular Activated Carbon (GAC) filters are an excellent choice for the removal of Pesticides, Chlorine, Taste & Odour and Organics. Some types even reduce metals. There are many types but the main variations are coconut coal, wood based or bone.
Granular Activated Carbon is a specialised filter media used principally for removing Chlorine or Organic compounds in water. The benefit of these are that they as well as a filter to remove or reduce significantly taste, odours and chemical taint it is used as a final stage in water treatment to polish up the water before its use. The Granular Activated Carbon (GAC) coconut, coal or bone derived are heat treated in the absence of oxygen in a furnace and then activated usually with steam. These activated granules are of irregular size with a vast structure of pores creating a large surface area for adsorption.
The (GAC) works by absorbing the soluble pollutants onto its surface and activated sites and holding them. Eventually all the sites become filled and blocked and become blinded and requires replacing. In some instances as the contaminants are absorbed onto the GAC backwashing of the filters may be considered, this allows the pollutants to remain firm but enables the GAC to be rebeded by fluidising and stopping channelling.
By choosing the type of GAC to be used coconut, coal, wood etc and by treating it in suitably different ways its performance may be tailored and optimised to suit a particular need. Coconut shell is used for de-chlorination, organic colour removal and chorine removal for RO membranes. Coal based GAC is often used for removing large chain molecules or where high hardness and mechanical strength required. If the carbon is treated with silver it acts as a bactericide and reduces the effects of bacteria. Acid washing carbon increases the purity, reduces the ash content and is very good for ultrapure water treatment systems. Bone charcoal is phosphate rich and good at reducing natural colour and heavy metals including lead.
Water flows into the valved head at the top of a pressure vessel down through the CAC media and then through the riser tube in the middle of the vessel. As the water travels through the media the sediment and pollutant is trapped so only clean water flows to service. There are timer options or water meter controlled to be set for automatic self clean backwash and sent to waste via a drain.


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The full range of HydroChem Services:

Water Treatment - Industrial
We are leading supplier of Legionella compliance services, water hygiene risk assessment, water treatment, installations and maintenance.

Water Treatment - Domestic
Assessing systems that may pose a risk to exposure to legionella, including humidifiers, air washers, emergency showers and indoor ornamental fountains.

Risk assessment
Ensuring all commercial premises have a statutory duty to control the risk of legionella bacteria in water systems.

Water Hygiene
Protecting the public from hazards associated with bacteria in water systems particularly Legionella.

Chemicals
We offer an extensive range of water treatment chemicals to suit all processes and requirements.

Chemical Cleaning & Disinfections
We have dedicated teams of experienced engineers to diagnose and give site specific recommendations.

Plant & Equipment
We offer a vast range to ensure that processes are effectively operated to their maximum advantage and costs.

Remedials
After a Legionella risk assessment, it is likely that corrective or improvement works are required to bring your system up to compliance.

Mould, Air & Surface Remediation
Our protocols allow a building or site be kept clean, environmentally sound and free of contamination.

Borehole Water Treatment
We offer an extensive range of borehole water treatment options to suit all processes and requirements.

