Pick up the incorrect statement from the following regarding fire hydrants

Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire
 
The minimum water pressure hydrants, is kept 1.5 kg/cm2
 
The water at pressure 1 to 1.5 kg/cm2 is made available for 4 to 5 hours for constant use
 
None of these.
 

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