Gypsum for Water Clarification

Water ClarificationGypsum Can Be Used for Safe Water Clarification of a  Muddy Pond or Lake Water

Gypsum (CaSO4) is a water soluble mineral that can be found in fertilizers and mixed in many other products. It is pH neutral, therefore, its application does not have the risk associated with alum treatments. Gypsum works for water clarification by attracting clay particles together to form clumps or what we call floccules. As the clay particles continue to clump they eventually increase in weight and settle to the bottom of the pond of lake.

USA Gypsum Comes in Various Forms and Sizes to Meet Your Needs:

Pulverized GypsumPulverized Gypsum

  • Variable particle sizes deliver extended release
  • Broadcast with “vicon” style spreaders or drop spreaders designed for powder

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Granular GyspumGranular Gypsum

  • Free flowing, low dust, slower release
  • Broadcast with any style fertilizer spreader

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Pelleted GypsumPelleted Gypsum

  • Fastest acting form of gypsum
  • Low dust, free flowing, slower to release
  • Broadcast with any fertilizer spreader
  • Care must be taken to keep completely dry until applied

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Ultra-fine GypsumUltra-Fine Gypsum

  • Particle size from 1/8” to dust
  • Fastest acting, hand apply

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Water ClarificationHow Much Gypsum to Use

To determine the amount of gypsum, needed, obtain six one gallon glass jars. Fill 5 jars with the cloudy/muddy pond water. Reserve one jar of pond water as a control for comparison. The sixth jar is used to prepare the test solution. This jar should be filled will clear water that is not affected (collected rainwater is best, or obtain water from a nearby clear ponds or stream). The remaining four jars are treated at various rates of test solution to determine the rate that provides the best clearing of the water. Use the following procedure:

Using a standard measuring spoon, add two level teaspoons of gypsum to the gallon of clear water. Stir until the gypsum is in a slurry. Add different amounts of slurry to individual test jars. Allow the test jars to set undisturbed for 12 hours. The minimum amount of slurry that clears the water will be used to determine the amount of amendment to apply based on the following table

Source: Texas A&M

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