Català: Bassa de decantació de sòlids en suspensió. El decantador hom diu primari perquè encara no s'ha estimulat la digestió microbiana en el fluid que passa per ell. Fotografia feta en l'EDAR de Montcada i Reixac (Barcelonès).
English: Suspension solder decant bundle. The decanter is called primary because microbial digestion has not yet been stimulated in the fluid that passes through it. Photograph taken in the WWTP of Montcada i Reixac (Barcelonès, Catalunya).
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