A liquid polymer dosing and mixing chamber and pump having a hollow chamber, a blending reactor, a progressive cavity pump, a mixing cup, a submersible actuator, and an aging cup within the hollow chamber adapted to create doses, via the progressive cavity pump, of a first substance and to mix it with one or more substances introduced into the blending reactor via one or more inlets.

A liquid polymer dosing and mixing chamber and pump having a hollow chamber, a blending reactor, a progressive cavity pump, a mixing cup, a submersible actuator, and an aging cup within the hollow chamber adapted to create doses, via the progressive cavity pump, of a first substance and to mix it with one or more substances introduced into the blending reactor via one or more inlets.

A stirrer arrangement including a shaft, a drive device, a hub body, and at least two blades. The at least two blades are arranged on the hub body and extend radially from the hub body relative to the rotational axis. Each of the at least two blades has a foot that is configured to fasten on the hub body and, along a radial extent, a leading-edge region and a trailing-edge region opposite the leading-edge region. The hub body has a wall in which depressions are provided to receive the blade feet. On an outside of the wall, recesses are provided which reach up to a part portion of the depressions. In a vicinity of the foot, each blade has an extent which protrudes beyond the foot, is formed by the leading-edge region and protrudes into the respective recess.

The invention relates to a method for controlling a flow generator (1) in a tank (20) configured for housing a liquid comprising solid matter, the flow generator (1) comprising an impeller and being located at a height (h-mixer) in the tank (20) and the tank (20) having a predetermined maximum filling height (h-max), wherein the flow generator (1) is configured to be operated at a variable operational speed (n) and the demand of operational speed (n-demand) is dependent on the present liquid level height (h-present) in the tank (20), wherein a max operational speed (n-max) of the flow generator (1) is the operational speed required when the liquid level in the tank (20) is equal to the maximum filling height (h-max), the present operational speed (n-present) being set equal to the demand of operational speed (n-demand) of the flow generator (1) that is determined using the formula: $\left(n-\mathrm{present}\right)=\left(n-\mathrm{demand}\right)=\frac{\left(n-\max \right)}{\left[\left(h-\max \right)/\left(h-\mathrm{present}\right)\right]^a}$ at least when [(h-mixer)+X](h-present)(h-max), wherein a() and a<1, X=radius of the impeller of the flow generator+1, and all heights and measures are given in meter.

An example fluid moving device for manure agitation in a pit located beneath a confinement building can include: a boom extending vertically into a pump-out wall of the pit; and a mechanism for extending horizontally into a main chamber of the pit to provide agitation. In some examples, the device can also include a self-propelled mechanism for moving along a surface.

An example fluid moving device for manure agitation in a pit located beneath a confinement building can include: a boom extending vertically into a pump-out wall of the pit; and a mechanism for extending horizontally into a main chamber of the pit to provide agitation. In some examples, the device can also include a self-propelled mechanism for moving along a surface.