A self-enclosed tablet dispenser for dispensing tablets into liquid-filled containers, such as swimming pools, including a first tube to hold the tablets, a base connected to the first tube with a horizontal passageway in which a plunger slidably reciprocates to move the tablet from the bottom of the first tube at one end of the passageway to the other end of the passageway, and a second tube connected to the base at the other end of the passageway to guide the tablet into the liquid by gravity means. The second tube may be open-ended on the bottom, or it may be closed so as to hold the tablets while allowing the liquid to enter and thus dissolve the tablets.