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To increase the pressure you would have to reduce the diameter of the pipe. Half the diameter would give you twice as much pressure. Therefore to get 25 percent more pressure you would reduce the diameter by 25 percent giving you 37.5. Be careful though, this only increases the water pressure not the water flow rate.

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Q: You had a shower system that required 2.5 bar pressure to operate however the incoming pressure is only 2 bar max on a Dia50 nominal pipe how can you increase the pressure without pumps?
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