Our start-up hot tub shock comes in a single, easy-to-pour packet. No more measuring out capfuls per your gallon size. Once in the water, Spa Frog Jump Start quickly dissolves before it hits the bottom of the hot tub so it won’t bleach surfaces. You can see the bubbles as it goes to work providing an initial chlorine level for your freshly filled hot tub. Using Jump Start takes the load off your Spa Frog @ease SmartChlor® Cartridge or FROG Serene® Bromine Cartridge so they last a bit longer.