RetroFAST Septic System Enhancement is an advanced treatment unit that upgrades an under-performing septic system. The RetroFAST unit is made up of a white liner, several blue media blocks, an airlift device, and a remote blower (connected to the airlift via pipe). The blower is the only moving part for the system. The RetroFAST is a compactable unit inserted directly into the existing septic tank through a minimum 18” (45cm) manhole. The installation can be completed without the need for heavy machinery, usually in a few hours.