HI, MY HUSBAND HAS JUST TURNED OUR BATH ROUND AND FITTED MIXER TAPS. THE FIRST MIXERTAPS HE FIT THERE WAS NO PRESSURE AS WE GOT 14 TURN ONES. WE NOW HAVE GOT ORDINARLY MIXER TAPS AND THE PRESSURE TO THE BATH IS VERY GOOD, BUT WHEN WE PULL THE MIXER THE PRESSURES IS VERY POOR. ANY IDEAS WHY?