For in ground pools up to 25000 gallons, with no room for installing a complete Frog® Fresh Mineral Water Pool System, there’s Instant Frog®. This insurance policy against bacteria sits in the skimmer basket of your pool and lasts all summer, while reducing chlorine use and making pool care an instant success. The Instant Frog® Mineral Pool Sanitizer uses the same revolutionary mineral formula and technology as our Pool Frog® products and reduces chlorine use by up to 50%, resulting in less skin irritation, faded bathing suits and a cleaner feeling pool