NT Labs Malachite 250ml - Treats 20000 litres / 4400 gallons. - NT Labs Malachite 500ml - Treats 40000 litres / 8800 gallons. - NT Labs Malachite 1 Litre - Treats 80000 litres / 17600 gallons. - NT Labs Malachite 2.5 Litre - Treats 200000 litres / 44000 gallons.
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