Algatec is a highly effective, dual-action algaecide that quickly kills all types of green and yellow algae in 4 to 24 hours. The product also eradicates stubborn black algae growths with minimal brushing. Algatec’s powerful interaction with chlorine based sanitizers help to enhance algae cleanup and removal. This is due to it’s alga stat inhibitor function. Algatec also leaves pool water sparkling clear due to its strong polymeric clarifying action.