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November 7, 2009
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Tetra Hardness Test Kit

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Tetra Hardness Test Kit
General Hardness
Measures dissolved calcium and magnesium salts. These salts directly influence the metabolish of fish, plants and microorganisms. High levels are considered hard, low levels soft.

Carbonate Hardness (aka - Alkalinity, Buffering Capacity):
Alkalinity or Carbonate Hardness (KH) is a measure of the buffering capacity of water, or its ability to resist change in pH. Ponds where alkalinity is allowed to drop too long or too low can often suffer a situation where the pH then "crashes" to levels below 5.0 - leading to very inefficient or total loss of biological filtration and direct irritation or stress on some fish species.

This kit contains:

  • One 10-ml test reagent
  • A test vial
  • Instructions and recommendations

  • ITEM: 160128
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    This kit contains:

  • One 10-ml test reagent
  • A test vial
  • Instructions and recommendations

  • In most waters, biocarbonate salts form part of the total water hardness
  • These biocarbonate salts make up the carbonate hardness or KH value
  • Biocarbonates have an important function in your overall chemistry of pond water
  • Acting as a pH buffer, preventing sudden and potentially harmful changes in the acidity or alkalinity of the water
  • If biocarbonates (low KH value) the release of acidic substances from the natural decomposition of organic material can cause a dangerous reduction in the pH of the water
  • The higher the KH the better pH buffering, but very high value can result in the water becoming alkaline
  • Faverable levels of carbonate hardness are between 3 degrees and 10 degrees dH(degrees of German hardness)
  • This item ships via UPS Ground
    Use Pond Salt to help soften the water

    Test for all problematic areas with the Master Test Kit


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