Aquarium Mineral Balance Test Strips

SKU: 33813-Hard

$13.95USD or lower Each

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Maintain optimal calcium and magnesium levels in aquariums and aquaculture systems using Indigo® Water Hardness Test Strips. Essential for healthy fish, corals, and biofilter performance.

In both freshwater and marine systems, water hardness plays a critical role in fish health, shell formation, and biological filtration. Calcium (Ca²+) and magnesium (Mg²+) ions stabilize pH and support nitrifying bacteria responsible for ammonia detoxification. Indigo® Water Hardness Test Strips provide a rapid, accurate check of total hardness, essential for aquarists, aquaculture technicians, and marine biologists maintaining balanced ecosystems.

Details Specs Docs Reviews
Details
Discipline / User Key Learning or Application
Biology Understand mineral homeostasis and osmoregulation in aquatic species.
Environmental Science Study interactions between hardness, alkalinity, and biological filtration.
Aquaculture Technology Apply hardness monitoring for improved yield and system stability.
Education / Teaching Labs Demonstrate relationships between dissolved ions, pH buffering, and organism health.

Best Practices Summary

  • Monitor hardness with each water change or system refill.
  • Maintain species-appropriate ranges (e.g., 75–150 ppm for tropical fish, 200–400 ppm for marine).
  • Combine with pH and ammonia tests for a full water-quality profile.
  • Keep extra strips dry and sealed for reliable readings.
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Specifications
  • The number of strips (50) vial is approximate.
  • Shelf life is 3 years but if bag is properly sealed, they should be good for a minimum of 5 years or more.
  • Strips will degrade if exposed to sunlight and come in a dark bag to prevent this. Do NOT transfer to a clear bag or strips will degrade quickly.
  • Test strips are made in USA & calibrated with NIST standards.
Documentation

Test Strip Documentation
Stability Statement Certificate of Analysis SDS
Indigo Water hardness test strips 0-500ppm Stability Statement Indigo Water hardness test strips 0-500ppm Certificate of Analysis Indigo Water hardness test strips 0-500ppm SDS
Reviews (1)
2023-08-10

I wanted to find out how hard the water here is, because some water is used with the HVAC condenser on the hottest days. My tap water is very hard - 500PPM was indicated. I knew the water was hard, but not that hard. By contrast, the "5-gallon filtered bottled water" from the self-fill machine at the grocery store showed "0" ppm hardness. It is obvious I will have to install a filter for the condenser water spray so that calcium mineral deposits do not build up on the aluminum coils. The purchase of these test strips was well worth it!

— Patrick
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