To change the stream of the water just you should turn the knob to substitute the pressure inside the hose.

Weak flow of water may be caused by low pressure inside the pipes which can only be fixed by a licensed experienced plumbing technician If the pressure inside the pipes is too low the water’s stream may be too insufficient to use it. We offer to solve problems with low pressure and high pressure in the pipes in less than 20 minutes. If you are not happy about the low pressure of the water in your handbasin or shower, a plumber can easily put right it.

If the pressure inside a upvc pipe is too high and the plastic tube itself has cracks it may end up in a leakage.

The boiler may not be running effectively as a result of low pressure, hence it could be a sign of something more serious like a leak in the system. Water may not be running as a result of low pressure in the pipes which can be safely solved by a experienced plumbing specialist