Brightwell Magnesion - 500ml As just one example

As just one example

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The DOS uses much larger tubing and fittings

Magnesium is depleted by algae growth and also by the use of excessive kalkwasser or by going far beyond natural calcium

All the installation parts are included and a magnetic coupling allows you to easily mount or adjust the dual-sensor

Brightwell Magnesion - 500ml As just one exampleConcentrated Magnesium Supplement for All Marine Fish & Reef Aquaria Overview Highly concentrated ionic magnesium solution. Provides magnesium, which helps regulate the balance between calcium and carbonates in aquarium water, and is a component of aragonite, the mineral secreted by reef building organisms such as corals, clams, and their allies to form skeletal material. Stronger than most competing products. Contains no unwanted organic material