Fresh 'N Clear is a new quick-dissolving, non-chlorine shock that makes your pool sparkle and leaves your water well... 'Fresh and Clear'. By eliminating organic contaminants it allows chlorine to work more effectively. And you can swim as soon as fifteen minutes after use. Dosage: 1 lb. Per 10,000 gallons every 1-2 weeks. Dosage: 1 lb per 10,000 gallons