A jet-mixer for a fluid mixing system includes a housing including a mixer port formed in an inner surface of the housing, and a rotor rotatably disposed in the housing, the rotor including a rotor blade, wherein the rotor includes a first angular position in the housing restricting fluid flow through the mixer port, and a second angular position allowing fluid flow through the mixer port, wherein, in response to rotation of the rotor in the housing, the jet-mixer is configured to inject a first fluid jet through the mixer port into the passage of the fluid conduit that has a pulsed velocity profile.