What is Alum?
Alum is Aluminum Sulfate. This is the most widely used product to treat municipal waste waters for clarity and phosphate control. The Aluminum ions bond with phosphate molecules 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.
Standard Alum is quite acidic and a large dose will lower pH and harm fish. The buffering agent in PHOSCLEAR® holds pH steady.
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 (1.5 lbs) of PHOSCLEAR® to a 5500 gallon Koi pond.
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After 2 Hours
After 18 Hours