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If you experience a TCP-like taste in your drinking water it is often related to part of the internal plumbing or associated internal pipework, eg, hoses.
The most frequent cause is the hose connecting the mains and a washing machine or dishwasher.
Flexible hoses can release small amounts of phenolic compounds. When mixed with the chlorine already in the water these compounds react to create chlorinated phenols which give a TCP-like taste to the water.
This tends to happen when an original hose is replaced with one that is not approved or recommended by the manufacturer.
The quickest and easiest way to identify if an appliance is causing the taste problem is to turn off the water supply to the appliance using the service valve at the point where the hose connects to the mains supply. Please ensure that the appliance is not in use.
With this valve closed water from inside the hose cannot get back into the supply that feeds your tap so the taste should disappear.
Closing this valve is a temporary fix as opening the valve will cause the issue to return.
To resolve the problem, you can either: