Metabiosis group focus on the chemical processing and recycling of waste. They primarily work in waste water and sewage treatment systems but have recently branched out into air purifying systems as their staff were constantly complaining about the air quality in their places of work. Their unique brand of air filters comes pre-installed in any of their water treatment facilities, but can also be bought separately for other uses. Domestic sewage treatment facilities cost between £2500 (for a 3 bed home) and £7000 (for around 50 people). Around £1.5 million will provide sufficient waste handling for 10,000 people.