hi. if all my showers got water directly from the tank, but the water pressure is really slow, what could be the problem? my friend said water pump only sucks in water to the tank, but in wont push water to the showers. is this true? i'm looking for a reliable pump that could help me resolve my problem. can you suggest a good but not overpriced water pump (that would resolve my problem)? my house is double storey with 3 bathrooms (2 upstairs, 1 downstairs). TQ