Filter media refers to a material or substance that is used to remove impurities or contaminants from a fluid or gas stream as it passes through a filtration system. Filter media can take many forms, including solid materials such as sand, gravel, or activated carbon, as well as fibrous materials like paper or fabric.

Industrial pit cleaning refers to the process of removing accumulated solids, liquids, and debris from pits or sumps in industrial settings such as factories, warehouses, and processing plants. Pits are often used to collect and store wastewater, process liquids, or other types of industrial waste.

A heat exchanger is a device that is used to transfer heat from one fluid or gas to another fluid or gas, without the two fluids or gases coming into direct contact with each other. It is commonly used in industrial, residential, and commercial applications for heating, ventilation, and air conditioning systems (HVAC), power generation, chemical processing, and many other fields.