Abstract: The present invention provides a strainer for use with a water pump in a mine that includes a grill for preventing the ingress of solid material over predetermined dimensions, and an air discharge structure positioned so as to produce a continuous flow of air to remove the material from at least part of the grill, so that flow is maintained through the strainer.

Abstract: A system for generating a secure document for conveying sensitive information includes a customer information receiving module, an encoding module in data communication with the customer information receiving module, and a printing module in data communication with the encoding module. The printing module is configured to provide printing instructions sufficient to generate a secure document from the customer information. The printing module and the encoding module cooperate to at least partially encode the secure document, where the partially encoded portion of the order form comprises sufficient information to convey the sensitive information to a recipient.