I used this for one month, but I'm selling it because I didn't need to refill the water. It comes with a new cartridge, so you can use it right away. The container has been disinfected and cleaned. Please note that although it was used for one month, it has been stored at home for a longer period. +AQUA 2 is a 2L circulating water purifier for dogs and cats, and it can be easily disassembled and cleaned. - Model Name: +AQUA 2 - Capacity: 2L - Application: Circulating water purifier for dogs and cats - Features: Easy to disassemble and clean - Power Source: AC power - Filter: Replaceable Thank you for looking.