Natural Chemistry Clear is a powerful all-natural clarifier that will remove any contaminant particles in your pool water, eliminating cloudy, hazy, or dull water quality. Its unique formula uses ground-up crab shells because of their natural ability to attract and absorb particles from water, giving you crystal clear water without adding harsh chemical solutions. Best of all, Clear is completely safe to use with all pool surfaces and sanitizers, giving you no reason not to use it in your pool.