Mermaid by Brilliance for Spas Sanitizer Dispenser 3 pack. Contains about 3 Month Supply for the average spa. Pre-filled sanitizer dispenser that replaces a floater. Eliminates the need for manually dosing sanitizer. Fits neatly into the skimmer box or filtration area. This package contains: 3 x 8 oz. Spa Mermaids. Click on picture for super zoom image.