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Regarding negative pressure and zero pressure.

Hello Sir,

1. i have attached the water gems file in which i m getting negative pressure and zero pressure. Why i m getting this value and How can i increase the pressure as i know pressure can not below 7 m of H2O.

Some of the pipe i m mentioning here like P-78, 98, 96 ,95 & P-2 , 5 etc.

2. Please also tell me where i need to use pump or valve.

ZONE - 4.wtg