pond algae - Knowledgebase Question

Greencastle, Pe
Question by chuckrob
March 8, 2010
is there any way i can keep my pond from developing so much algae in the summer?We treat it with algae blockers and we have a filtered pump.It is not a super large plastic form pond.

Answer from NGA
March 8, 2010


Some smooth algae growth on the sides is considered a sign of good health in a pond. Fish feed on algae. But too much algae, floating or attached, detracts from your enjoyment, causes large pH fluctuations, and can dramatically reduce oxygen levels at night. The underlying cause of algae blooms or excess string algae is an overabundance of nutrients. Algae is controlled by killing algae cells, removing sunlight, or removing food. Floating and marginal plants will reduce the amount of sunlight reaching the pond and inhibits algae growth. Covering approximately 60 - 70 percent of the pond surface with floating plants is the easiest approach. Manually remove string algae with a brush or similar implement. Clean the implement with bleach after use. Think of this as harvesting and removing excess nutrients. Try not to let rainwater runoff from the yard enter the pond. It may be carrying lawn fertilizer. A non-toxic blue or black aquatic dye may be used to reduce the amount of sunlight entering the pool. However, this will require raising submerged plants more closely to the surface of the pond, and some of the dye is removed with partial water changes. Hope one or all of the above strategies works!

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