Fluid treatment apparatus and method applicable for PCB etching

A fluid treatment apparatus and method applicable for PCB etching, by applying the first and second fluids onto the article passing by one of them, having the device: a casing, for defining a chamber inside it; the first fluid injector, disposed in the casing, for injection of the first fluid onto the surface of the article; the first device, for collection of the primary volume of the first fluid being injected onto the article in the casing chamber, being a minor part of the fluid not collected by the first device in the chamber and the collected major volume taking the first position in the chamber; a device for circulation of the first fluid being collected in major volume to the first fluid injector; the second fluid injector, including the first and the second fluid applicant, disposed inside the casing, for injection of the second fluid roughly onto the surface of the article on the adjacent first fluid injector position; step water reservoir, including the first and the second collection chambers, for