The hygiene steps that leave a new or repaired cold water system clean before use.
A new cold water system can carry swarf, jointing debris, dust and contamination from installation, so it is cleaned before anyone drinks from it. Use this as a revision checklist of the hygiene principle; follow the current guidance for the disinfection method and any sampling.
- Keep it clean as you build. Cap open pipe ends, keep fittings clean and store pipe so dirt and vermin cannot get in, because prevention reduces the cleaning needed later.
- Flush thoroughly. Once the system is complete and sound, flush it with clean water to carry away debris, working through the outlets so every part of the pipework is cleared.
- Decide if disinfection is needed. Depending on the type and size of the installation and the guidance that applies, the system may need disinfecting as well as flushing, particularly for larger or stored-water systems.
- Disinfect correctly where required. Use the appropriate method and contact time, keeping the disinfectant in contact with the wetted surfaces as the procedure specifies.
- Rinse and return to use. Thoroughly flush out any disinfectant afterwards so the water is wholesome before the system is used.
- Protect stored water. Make sure cisterns are covered, screened and clean so the system stays hygienic after commissioning.
The aim is wholesome water at the tap from day one. Confirm when disinfection is required, the method, and any sampling against the current WaterRegsUK and industry guidance.