Abstract: A system of directional bubble walls includes a plurality of bubble walls. Each bubble wall may have a shape elongated in one linear direction and have multiple air outlets directed in a perpendicular direction to the elongated direction. The air generated out of air outlets forms a blockade that either blocks particulates in water from moving through it or pushes the particulates away from it. The bubble walls may be placed in parallel to each other and separated from each other by a distance. An air source connected to the bubble walls may sequentially turn on and off the bubble walls such that the water particulates may be removed and pushed in a desired direction. The bubble walls may also be turned on simultaneously, and other modes of operation may be adapted to effectively remove and move water particulates.

Abstract: A carrier for elongate, cylindrical chalk sticks comprises a body of flexible material having opposite ends, opposite sides, and inner and outer surfaces. Chalk stick pockets extend into the body from the inner surface toward the outer surface in four rows spaced apart in the direction between the opposite sides and each row includes 50 pockets spaced apart in the direction between the opposite ends. The pockets are elongated in the direction between the opposite sides of the body, and said body is rollable in the direction between the opposite ends to form a roll enclosing said pockets and which roll can be releasably held in the rolled condition by suitable fasteners.