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https://www.swelluk.com:443/aquarium-systems-seatest-calcium-test-kit-ca/ 
Aquarium Systems SeaTest - Calcium Test Kit CA
Keep your marine tank's calcium levels in check with Aquarium Systems SeaTest - Calcium (CA) Test Kit. Calcium is very important for corals and coralline to promote beautiful colours and a healthy skeleton.
Product Information
Your reef aquarium's calcium requirements tend to increase as they grow and mature, that's why it is important to conduct regular testing to ensure your calcium levels don't drop too low. Use Aquarium Systems SeaTest - Calcium to assess your tank's calcium levels and make sure you can provide the optimum environment for your growing corals.
- For seawater.
- Value recommended: 400 to 450mg/l of calcium.
- Too low a level impairs coral growth.
- The test displays the calcium value in graduations of 20mg.