What common quality defects does Commercial Coffee Machine water filter have?

Please verify the following points and require itemized written supplier responses:（Commercial Coffee Machine water filter） Confirm daily cups, beverage menu, bean type, grinding requirements, pump pressure, water temperature, steam capacity, water filtration and bar workflow. Check the brewing unit, grinder, pump and boiler, control panel, steam wand, filter, group head, heating block and cleaning kit. Define capacity, accuracy, materials and operating environment before requesting quotes on a uniform basis. Request specification sheets, test reports, certificates, maintenance manuals and spare-part lists. During acceptance, verify appearance, dimensions, functions, safety protection and packaging, and keep test records. Do not compare unit price alone; include customization, freight, spare parts, after-sales support and downtime risk. Keep written records of inquiries, confirmations, FAT, acceptance and warranty commitments.