Overview
The ASF Calcium Test Kit delivers fast, reliable Ca readings to help you keep calcium in the optimal range for SPS/LPS corals, clams, and other calcifying invertebrates. Stable calcium supports strong skeletal growth and works hand-in-hand with alkalinity and magnesium balance.
Key Features
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Reef-focused range for seawater calcium
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Clear end-point color transition for confident results
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Straightforward workflow—complete a test in minutes
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Repeatable dosing with calibrated dropper/syringe
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Cost-effective with multiple tests per kit (usage dependent)
How to Use (Summary)
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Rinse the vial with sample water; fill to the marked line.
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Add the specified drops of Reagent A; cap and swirl gently.
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Titrate with Reagent B (drops or syringe) while swirling until the color shift indicates the end-point.
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Use the included chart/scale to read calcium (ppm) based on drops/volume used.
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Rinse all parts with fresh water after testing.
Target guidance: Many mixed reefs maintain ~400–450 ppm Ca (with stable alkalinity and adequate magnesium).
Best Practices
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Test at the same time of day for consistency.
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Log results; re-test after large water changes or dosing adjustments.
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If a reading seems off, run a control using freshly mixed saltwater.
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Keep reagents tightly capped; avoid cross-contamination of droppers and vial.
What’s in the Box
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Calcium test reagents
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Glass/plastic vial with cap
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Syringe / dropper(s)
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Color chart / conversion card
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Quick-start instructions
Product Specifications
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Type: Colorimetric/titration calcium (Ca) test for marine aquariums
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Readout: Parts per million (ppm)
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Use Case: Routine Ca monitoring and post-dosing/water-change checks
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Aquarium Type: Marine/reef
