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HD9140/90 DISASSEMBLY- AND RE-ASSEMBLY ADVISE - To disassemble the base cover, remove the 7 screws - Decalcification (5 of them hidden under the rubber feet). Fill the water tank to the MAX level with white vinegar (8 % acetic acid). Do not use any other type of descaler! Put the drip tray, all bowls and the lid on the base properly.