This flocculated material must be removed from the system or it will dissolve and become nutrients which feed a new plankton bloom. The Pond Clear powder will precipitate nutrients in the pond and starve the algae. Both of these products will help achieve a natural balance more quickly. Natural balance is the goal Basically, to control algae naturally we must limit sunlight and nutrients. Algae requires sunlight.
Deep ponds are preferable in well lit gardens.
Sheltering your pond from sunlight will make algae growth much easier to control. An overhead structure will provide shade in Koi ponds. Water Lilies provide shade in water gardens. Nutrients are fish waste, ammonia, fish food, decaying algae, dead fish, leaves, debris, and even phosphates or nitrates in tap water. A good rain can leach fertilizer into a pond.