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Another detail that was addressed in the Agalteca Rapid Mix Tube installation was the delivery of the dosed alum into the Rapid Mix Tube itself. To accomplish this delivery, the end of the flexible tubing running off of the doser's level arm was fitted with a small plastic elbow, then attached to the edge of the large scale mixing orifice using a small plastic clip. This allows the alum to be delivered directly into the flow of water entering the tube, improving mixing and reducing the chance that alum will escape into the entrance tank.

Figure 1. Photo of the attachment of the aluminum sulfate dosing tube to the top of the Rapid Mix Tube in the Agalteca plant. The wire in the

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left of this photo is attached to the Rapid Mix Plate; this allows for easier removal of the plate as the operator can simply pull it out of the tube instead of reaching into the tank to retrieve the plate.