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The problem could be with your tap seats (ie the metal part of your tap that creates a seal with the tap valve). You could try a product such as our FIX-A-TAP Handyman Tap Reseater which will gently grind the metal to a more smooth surface. If this does not work you may have to contact a licensed plumber for a more thorough tap reseating (or to investigate if another problem is causing the issue). We recommend that our other tap reseating tools should only be used by professionals due to the damage that can be caused if they are used incorrectly.