A starter kit gathers the essentials for a fresh hot tub or spa pool into a single box, so you are not left guessing which chemicals to buy first. Each Zagosa kit pairs a sanitiser with the balancers and test supplies you need to fill, treat and check the water from day one. Choose chlorine or bromine, then pick the tier that suits: Basic for the essentials, Standard to add foam control, Premium for a full care regime, or Premium Plus for deep-clean flush and cartridge care.