Refillable chemical reservoir system for trigger sprayer

A chemical concentrate reservoir system for use with a hand held trigger sprayer device and a bottle reservoir containing a diluent, comprising:

• a chemical reservoir for containing a concentrate, said chemical reservoir arranged to removably fit within said bottle reservoir when said hand held trigger sprayer device is attached to said bottle reservoir;
• a first adapter connected with said chemical reservoir, said first adapter comprising a mixing chamber having at least one inlet and an outlet;
• wherein said bottle reservoir and said chemical reservoir are in fluid communication with said mixing chamber through said at least one inlet;
• a first valve at said at least one inlet of said mixing chamber for selective control of fluid flow into said mixing chamber;
• a tube within said chemical reservoir and connected with said outlet of said mixing chamber;
• and
• a second adapter connected between said chemical reservoir and said hand held trigger sprayer device, said second adapter being further connected with said tube and comprising a conduit for allowing the flow of fluid from said tube to said hand held trigger sprayer device, said second adapter further comprising:
• a filling port, said filling port being in fluid communication with an interior of said chemical reservoir;
• and
• an air port in fluid communication with said chemical reservoir and said filling port.