Automatic sand filter backwash controller

Abstract

A sand filter controller for monitoring and controlling an operation of a sand filter is provided. The sand filter controller includes a microcontroller that receives information about an operation of the sand filter from sensors installed in the sand filter, electrical relays that control air operated valves (AOVs) of the sand filter based on signals from the microcontroller, a liquid crystal display (LCD) screen connected to the microcontroller and that displays the operation of the sand filter, a position of each of the electrical relays, and a position of each of the AOVs, and a power supply that powers the microcontroller, the electrical relays, and the LCD screen. The sand filter is a single-housing-multi-stage water treatment sand filter.

Dependencies are inferred from the claim text.