Abstract: A self-uprighting aeration device that minimizes turbulence and disruption of any sediment layer in a tank. The device includes a float positioned about a first position on a longitudinal axis of the aeration device, a ballast positioned about a second position on the longitudinal axis, and a diffuser. The float and the ballast are configured to orient the aeration device in a liquid with the longitudinal axis substantially aligned with a gravitational vector to dispose the diffuser above the sediment layer. The aeration device can be configured to rest on a support surface in the tank or float above such a support surface. Methods for aerating liquid in tanks with the aeration device are also provided.

Abstract: A method and system to select, schedule, purchase, confirm, invoice, bill and settle service orders, such as home services orders from customers. The method and system accept electronic service orders as well as customer leads for services, selects service providers and schedule services in real-time via a computer network, confirms scheduling of service delivery in real-time, handles administrative and business details for both customers and service providers, as well as fulfills, tracks and settle service orders. The method and system also provide customized information for services available via an electronic services network and dynamically schedule services using plural electronic appointment calendars from plural service providers. The method and system includes customer service order and customer lead information and enterprise-wide visibility and management of business processes. The method and system may also be used for goods.