4. Install a non return valve
Fit a non return valve on your washing machine and dishwasher connection hoses to minimise any TCP, metallic or chemical tastes and smells.
These tastes and odours can be caused by the reaction between the small but essential amounts of chlorine present in tap water and plastic or rubber constituents found in common household appliances, including some kettles, tap washers, and the hoses connecting dishwashers and washing machines to the mains supply. View further information on tastes and smells.