Product Information Product Name : NuWater B-500Manufacturer: Enviro-Flo, Inc.Original Certification Date: 05/01/2015Certification Date: 05/01/2015Certification End Date: 05/01/2022Capacity: 500Material: ConcreteType: Aerobic Treatment SystemClass: Class 1 Certifications Certification: Certifications: NSF/ANSI Standard 40 Standard year: 2019 Version Year of Original Standard: 2004SPE#: 102 Approved Approved Aerators: Manufacturer: HiblowModel: HP40Hi Blow model: HP-40A Manufacturer: Hakko HK-40 Approved Diffusers: Model: Stones Approved Alarms: Manufacturer: Included on Aerator