E. coli and Coliforms - Signs of Dirty Water

These bugs come from faecal contamination (poo). If you find them, the water is not safe to drink. Here's what to do.

Understanding Your Water Test Results

A plain English guide to reading and understanding water test results from the lab.

Pseudomonas aeruginosa - What You Need to Know

A bug that grows in water pipes and can cause infections, especially in hospitals. Here's how to find it and deal with it.

How to Purge an Expansion Vessel

How to drain and re-pressurise expansion vessels in closed systems.

Flushing Taps That Are Not Used Often

How to flush taps and showers that are not used regularly to stop bacteria growing.

BG50 - Looking After Closed Water Systems

How to look after sealed heating and cooling systems. Covers cleaning, chemicals, and testing.

How to Descale a Shower Head

How to clean and disinfect shower heads to stop bacteria and scale.

How to Service a Mixer Valve (TMV)

How to look after thermostatic mixing valves so they keep water at a safe temperature.

Checking Water Temperatures

How to check hot and cold water temperatures to make sure they are safe.

ACOP L8 - The Legionella Rule Book

The main set of rules for stopping Legionnaires' disease in water systems. Written by the HSE.

HSG274 Part 2 - Hot and Cold Water Systems

The how-to guide for controlling Legionella in hot and cold water systems. Covers temperature checks, TMVs, and tank inspections.

How to Take a Legionella Water Sample

Step-by-step guide to collecting water samples for Legionella testing.

How to Take a TVC (Bacteria Count) Sample

How to collect water samples to check how many bacteria are in the water.

Checking a Hot Water Cylinder (Calorifier)

How to inspect hot water cylinders and do a blowdown to remove dirt.

Checking a Cold Water Storage Tank (CWST)

How to inspect cold water storage tanks to make sure they are clean and safe.

HSG282 - Spa Pools and Hot Tubs

How to keep spa pools and hot tubs safe from Legionella and other bugs.