Biocide treatment is a form of microbial control that uses chemicals to destroy or inhibit the growth of living organisms such as bacteria, mould, and algae. When used on roofs, it helps to remove moss, algae, dirt, and other contaminants while keeping the roof in good condition for longer. Biocide treatments added to water create a powerful cleaning agent that can protect against further growth and degradation of roofing.

You can use biocides with traditional methods to clean your roof; they can be part of a routine cleaning process and will not harm your roof's waterproof membranes. However, biocides do not last forever, so you'll need to reapply them every 2-3 years (depending on the product and the local environment).

Please note that Biocide treatments take time to show results, typically requiring a few weeks.

After the works there is a certain amount of dried up biocide on the roof and the gutter. The first good rain will wash the excess and you will need to disconnect any water butt is reconnected afterwards. The cationic activity drops as the product enters in contact with biomass. A drain will sanitise over a short length