Dealing with fat, oil and grease in your food business

Biological dosing systems use bacteria to break down fat, oil and grease and prevent blocked drains and sewers. You might choose this set up if it is impractical to fit a grease trap due to space or hygiene reasons.

How does a biological dosing system work?

The most effective biological dosing systems introduce a large initial dose of bacteria into the drainage system. The bacteria are allowed to establish and colonise, forming a biological film lining the drain.

A dosing unit is installed to release measured quantities of the bacteria, along with nutrients, into the drainage system at regular intervals to maintain the bacterial colonies.

Proper use of a biological dosing system

To ensure your system is working correctly:

• You should get specialist advice to ensure the correct choice of bacterial culture and dosing rate for your kitchen's needs.
• Make sure biological dosing systems are not used for clearing drain blockages. It is important that you remove any blockage before a biological dosing system is installed.
• Ensure you have strict controls on chemicals such as bleach, sanitisers or other chemical cleaners when you use biological dosing systems

Costs of biological dosing systems

A typical dosing system costs around £500 for initial installation and then £40-£60 per month for the dosing. The cost depends on the amount of fats, oils and greases entering the drainage system. Maintenance of the dosing system costs around £50 per year.