Abstract: A protective face mask having a main textile portion adapted to be worn over the mouth and nose, and comprising a perimeter and a filter portion. The mask further comprises a deformable member secured to the main textile portion near the perimeter, the deformable member circumscribing at least a majority of main textile portion, and being adapted to be conformed to the physical features of a user's face through the use of pressure, such that when the deformable member is so conformed, the mask will fit snugly against the user's face so that gaps between skin and the deformable member are reduced, thereby creating an inner air space; and, a mask securing system operatively affixed to the main textile portion for keeping the face mask securely in place during breathing; wherein the filter adapted to permit the exchange air between the environment and the inner air space.

Abstract: An ultraviolet reactor for irradiating a flow of fluid includes a set of UV lamps and baffles spaced along the ramps. The baffles generate helical flow of the fluid flowing along the lamps to enhance exposure of microorganisms carried in the fluid to UV radiation.

Abstract: An aeration measurement system for a fluid actuation system is disclosed. The aeration measurement system has a container configured to receive fluid, and a light source configured to emit light into the container. The aeration measurement system also has a light receiver that is configured to receive light from the light source while the light is passing through the fluid. The aeration measurement system further has a controller in communication with the light source and light receiver. The controller is configured to determine an amount of aeration in the fluid based on the received light.