Cus originally had a venturi shower fed of mains pressure cold and hot from the cylinder , there is no way without major disruption of getting equal pressure feeds to the shower , so new normal valve fitted with a pressure equalising valve , shower pressure is now pretty poor , is it possible to put any type of pump on this configuration , maybe a single impeler pump on the hot to boost it still with the pressure equalising valve ??? if so would the pump go before or after the equalsing valve ????