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https://www.swelluk.com:443/tropic-marin-magnesium-calcium-professional-test-kit/ 
Tropic Marin Magnesium / Calcium Professional Test Kit
Tropic Marin Magnesium / Calcium Combi Test Kit is great for keepers of marine reef aquariums, allowing for the simple and accurate testing of Mg and Ca levels in the water - both of which are needed for the healthy growth of hard corals. Too low, and you may want to consider topping them up with a buffer.
Product Information
The Tropic Marin Magnesium/ Calcium Combination Test Kit is an ideal addition to any marine keeper's kit.
This test kit is designed to a high standard, to test accurately and reliably for both calcium and magnesium. Using a colour changing system, the test gives comprehensive results for the best outcome.
Magnesium and calcium are vital for strong, healthy corals, as both of these elements build a healthy skeletal formation and promote high pigmentation. They are naturally depleted in any aquarium, so levels must be checked and replenished regularly.
Use a good calcium and magnesium supplement to regulate the vital levels and ensure that your corals glow with health. Try Tropic Marin Bio-Magnesium and Bio-Calcium, both excellent products to maintain the correct values in your aquarium.
Key Features:
- Suitable for marine aquariums
- Contains enough solution to perform 30 tests
- 1 x reagent
- Syringe
- Glass vial
- Colour chart
- Full instructions