Aluminum sulfate, or alum, has an affinity for phosphorus. In water, alum assumes a cotton-candy-like form, “a nice fluffy floc”. This floc (short for flocculation) grabs phosphorus and other particles as it settles to the bottom of the pond or lake, rapidly enhancing the clarity of the water.
There is an immediate impact. But quick clarity is just the beginning. Alum floc rests in the sediment and continues to bind phosphorus for years, even decades. Legacy phosphorus stays stuck in the sediment, starving potentially harmful algae in the pond.
Dosing lakes and ponds with alum is not a new practice—it was first tested in Sweden back in the 1960’s. But it is gaining popularity as water managers battle the specter of legacy phosphorus fueling algae blooms. More than 2,000 alum-treated lakes and ponds support a growing body of evidence for the efficacy. The science of alum has advanced substantially and continues to advance every year.
Product Freezing Point
Product Smells Like
UN3264, CORROSIVE LIQUID, ACIDIC, INORGANIC, N.O.S.(ALUMINUM SULFATE),8,PG III
Plastic jar or plastic drum
Product Physical State
Product is Restricted
- Avoid direct skin contact.
- May cause irritation of the eyes.
- Ingestion may cause intestinal upset
- Skin Contact: Wash affected area thoroughly with soap and water.
- Eye Contact: Flush thoroughly with water for 15 minutes
- Ingestion: Give two or more glasses of water or milk to drink. Do not induce vomiting.
See Material Safety Data Sheet for additional information.