What is Alum?
Aluminum Sulfate (Al2(SO4)3)is commonly called “ALUM.” This product is commonly used as a coagulating agent in municipal waste waters for clarity and phosphate control. It is also used in paper making, as a food chemical in pickling and as a “Stiptic Pencil” for superficial shaving cuts.
The Aluminum cations (Al +3) bond with phosphate anions (PO4 -3) in the water. The resulting Aluminum Phosphate (AlPO4) is insoluble in water. This precipitate settles to the bottom of the pond and the phosphate is no longer available as a nutrient.
Also, the Aluminum ions act to agglomerate suspended dirt particles leaving the fish pond water sparkling clear.
PHOSCLEAR® is not an aquatic herbicide. It is a water treatment product intended to improve water quality by removing soluble phosphate from the water column and by precipitating out suspended dirt particles to clarify the pond or lake.
How is PHOSCLEAR® different from Standard Alum?
Standard Alum is quite acidic and a large dose to a pond will lower the pH of the water. It the pond drops below pH of 6, fish can be harmed or killed. The buffering agent in PHOSCLEAR® works to hold the pH steady.
We recommend that you take a water sample and perform full tests for pond water chemistry (Ammonia, Nitrates, Nitrites and pH) before treating with PHOSCLEAR®.
PHOSCLEAR® quickly disappears and goes to work
Photos of an actual PHOSCLEAR® buffered aluminum sulfate treatment. The photos show elapsed time after addition of 3 cups (1.5lbs of PHOSCLEAR® to a 5500 gallon Koi pond. )