Applicable : For Roborock S8 pro Ultra/S8/S8+/ Q revo five Series/Q7 Series/S7 Max Ultra/S7 MaxV plus/S7 MaxV/T7S/T7S PLUS Volume: 1000ml This one is suitable, not original. Pay attention when orderingFirst step:Please stick with the dilution ratio of 1:200, (1 bottle cap is set 20mL, like minded for approximately 4L of water) after shaking evenly, you should use it. Second step:Add the mixed technique to Roborock S7&;s water tank, or add Roborock Dyad&;s clean water tank