A channel block for a chemical liquid dosing apparatus having an upper surface and a bottom surface opposite to said upper surface, a front surface, and a rear surface opposite to said front surface, wherein said front surface is orthogonal to said upper surface, said channel block comprising: a process outlet positioned to allow discharge of a chemical liquid from said channel block travelling towards a delivery point of said chemical liquid; a chemical liquid inlet configured to receive said chemical liquid travelling into said channel block ; an evacuation outlet positioned for evacuating excess chemical liquid in channels of said channel block ; channels provided within said channel block that connect at least said process outlet , said chemical liquid inlet and said evacuation outlet ; a pressure indicator mounted to said channel block to measure pressure of said chemical liquid entering through said chemical liquid inlet ; an evacuation regulation valve mounted to said channel block upstream of said evacuation outlet , and interacting with said channels to control passage of said chemical liquid through a channel of said channels connecting said chemical liquid inlet to said evacuation outlet ; and at least one control valve mounted to said block configured to control said chemical liquid passing through said channels , wherein a first control valve of said at least one control valve is situated with respect to said channels to control flow of said chemical liquid to said process outlet , wherein said evacuation regulation valve is positioned with respect to the at least one control valve such that a pressure set point of said evacuation regulation valve may be adjusted using said pressure indicator when said at least one control valve is in a closed position. a process outlet positioned to allow discharge of a chemical liquid from said channel block travelling towards a delivery point of said chemical liquid; a chemical liquid inlet configured to receive said chemical liquid travelling into said channel block ; an evacuation outlet positioned for evacuating excess chemical liquid in channels of said channel block ; channels provided within said channel block that connect at least said process outlet , said chemical liquid inlet and said evacuation outlet ; a pressure indicator mounted to said channel block to measure pressure of said chemical liquid entering through said chemical liquid inlet ; an evacuation regulation valve mounted to said channel block upstream of said evacuation outlet , and interacting with said channels to control passage of said chemical liquid through a channel of said channels connecting said chemical liquid inlet to said evacuation outlet ; and at least one control valve mounted to said block configured to control said chemical liquid passing through said channels , wherein a first control valve of said at least one control valve is situated with respect to said channels to control flow of said chemical liquid to said process outlet , wherein said evacuation regulation valve is positioned with respect to the at least one control valve such that a pressure set point of said evacuation regulation valve may be adjusted using said pressure indicator when said at least one control valve is in a closed position. <EOS>