hammering sound after i take a shower

[ozsithole]

After I take a shower (mixer),i start to hear this hammering/air lock sound from my pipes.The bathroom is on the first flow so is my feed through electric geaser,with a header tank in the loft.it doesn't go away until I open the bath cold water tape.The water spatters out then i get a steady flow after which its all back to normal.What could it be?

[DIY]

This might be water hammer, which is often caused by a worn washer/valve on a cold water storage tank or toilet cistern inlet valve.

new washer or valve usually cures the problem.

[meow2222]

check for hidden psychopaths. Or more likely water hammer.

NT