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Colombo GH Plus
Colombo GH Plus increases the levels of salts and minerals in your planted aquarium.
The reason why salts and minerals are added is to improve the health of fish and plants. Over time these minerals become depleted over time which is why it's necessary to add more.
Dosage is simple: Add 1ml per 5L of water - this increases your water hardness (GH) by 2.