The Whirlwind Linear Air Pump from Septic Services can be used in applications that require reliable aeration, including septic tanks and pond aeration. It doesn’t require lubrication or any tools to replace the included filter. The heat-resistant, powder-coated lightweight aluminum with outer steel cover provides reliable outdoor unprotected performance. They are designed to be energy-efficient and provide reliable aeration. A pump can be added to any small aerobic system up to the largest aerobic treatment unit. Pumps range from 1.7 up to 7 cfm, and are available with or without an external alarm. 877/583-0809; www.septicsuppliesinc.com.