Pool water should never have a color — especially if that color is green! FROG Algae Blocker 4Pro Drop ’n Go Pool Protection™ removes algae and prevents future outbreaks for up to 6 months. Each prefilled Drop ‘n Go pool pod fits any pool above or in ground, improves filter efficiency, eliminates the need for weekly dosing, and makes your job easier! Transform your pool service with tried, trusted and true, professional-grade pods.