Methods, devices and systems for refilling a liquid dispenser

A liquid refill system for use with a fragrance composition, said liquid refill system (10) comprising:

• a) a child device having a child liquid reservoir having a volume (VCR) and a child air outlet valve, said child device having a first portion having a child dispensing mechanism and a second portion having a child refill mechanism comprising a child liquid inlet and a child one way liquid inlet refill valve associated therewith;
• b) a parent device having a parent liquid reservoir containing a liquid, said parent device having a first portion having a parent refill mechanism, a parent liquid outlet, a parent one way liquid valve associated with the parent liquid outlet,
• said parent device having a parent pump having a pump volume (Vpp), in liquid communication with the parent liquid reservoir via a parent one way liquid inlet valve and in liquid communication with said liquid outlet, said parent device also having a liquid return valve and liquid outlet, wherein the ratio of the volume of the parent pump to the volume of the child reservoir is 12:1 or less.