Mixer tap runs after being turned off

[Lilt]

Hoping for a point in the right direction please guys. I’ve just fitted a new bath mixer with individual quarter turn taps for hot and cold.

The problem is when turned off water continues to flow fast for about five seconds, slows to a fast drip for about ten seconds then finally about twenty seconds stops completely.

Any ideas would be appreciated.

 

[footprints]

Might well just be the water in the spout draining out as air bubbles in to replace it.

 

[oldbutnotdead]

How's the water pressure in your house? If it's a low pressure tap (up to 1 bar, intended for gravity hot and cold) and you're running at 3 bar plus from a Megaflo or similar then there's your problem