Effluent treatment Domestic sewage purification involves building purification stations incorporating reed bed filtration. The basic principle is the horizontal and vertical filtration of effluents. Plant bacterium symbiosis causes degradation of organic matter. This process is suitable for communes of up to 2500 RE (resident equivalent) and for wine growers required to comply with new regulations. From a partnership with Serpol (SERFIM Dépollution) has emerged the Roseaulix process for the treatment of leachgates in non-hazardous waste storage centres. Albertazzi is installing the process across France; it is ecological, long-lasting and sustainable and combines a low investment cost with minimum routine maintenance. Other types of domestic waste purification are being developed, such as biodisc purification systems to meet the challenges of the public sector.