Concrete products for wastewater treatment, such as monolithic tanks, oil and grease separators, sedimentation tanks, and combined systems. Products: VR11, DISS90, IDRA50, PLUVIO50, SPLIT25, VR14, DISS100, IDRA60, PLUVIO60, VR16, DISS120, VR20, DISS150, IDRA80, PLUVIO80, VR25, DISS180, IDRA100, PLUVIO100, VR30, DISS200, IDRA115, PLUVIO115, IDRA125, IDRA150, PLUVIO125, PLUVIO150, IDRA200, PLUVIO200, VQ4, DISS30, VETT3, SPLIT7, VQ5, DISS40, SPLIT10, VQ7, DISS50, SPLIT15, VQ9, DISS60, SPLIT20, VC300, TRC1, VC700, TRC2, RAIN1, VC1000, RAIN3, VC2400, IDRA3, VET3, PLUVIO10, SPLIT2, VC3300, IDRA6, VETT15, PLUVIO15, SPLIT4, VC4000, SPLIT7, VC6000, IDRA20, PLUVIO20, SPLIT10, VC8000, IDRA30, PLUVIO30, SPLIT15, VC7000, IDRA25, PLUVIO25, VC9000, IDRA40, PLUVIO40, SPLIT20.