Amethyst hot and cold water spurting

HI all,

The hot and cold water water on our 2000 W Amethyst generally works, but every so often it splutters and spurts, showering water everywhere. This happens on nearly every use. 

The output side holds pressure, we can run water for a time even if the pump has been switched off for some while. A cracked filter casing has been suggested, but I don't know where to look for it. 

Any ideas on how to find the water filter?

Any other ideas on a cause? 

Cheers,

Malcolm

Could also be a nasty air lock

The filter on a Trailking pump is a small clear plastic assembly screwed into the inlet side of the pump.