water discharged from the treatment chamber 12 or the heat pump unit 50 the drainage tank 90 may be configured to function identical to the water supply tank 80 the drainage tank 90 may be disposed alongside the water supply tank 80 the clothes treatment apparatus 1 may further include a scent diffuser 100 configured to diffuse scent into the treatment chamber 12 the scent diffuser 100 may be disposed in the treatment chamber 12 after the scent diffuser 100 is completely used the user may replace the scent diffuser 100 with a new one in this implementation the scent diffuser 100 may be separably mounted in the discharge panel 15 the scent diffuser 100 may be inserted into an opening formed in the discharge panel 15 the user may simply pull the scent diffuser 100 to separate the scent diffuser 100 from the discharge panel 15 the scent diffuser 100 may be provided with a handle 129 the user may pull the scent diffuser 100 while holding the handle 129 to separate the scent diffuser 100 from the discharge panel 15 the scent diffuser 100 may be provided in a flow channel along which air blown by the blowing unit 30 is guided to the air blowing port 16 alternatively the scent diffuser 100 may be separably provided at any constructional component such as the door 20 other than the discharge panel 15 as long as the scent diffuser 100 can supply scent into the treatment chamber 12 hereinafter an example scent diffuser 100 will be described in detail with reference to fig5 to 17 a replaceable scent member 5 may be mounted in the scent diffuser 100 the scent diffuser 100 may.