Treats Cloudy Aquarium Water (1817 litres) Use Dr Tim’s Clear-UP Natural Water Clarifier to Clear Up Your Tank Clear-UP Natural Water Clarifier helps: Clear up cloudy white water Natural flocculent Beneficial bacteria can ‘floc’ small particles from water Clear water without harmful chemicals No odour 100% natural Clear-UP Natural Water Clarifier is used to clear up cloudy white aquarium water without harmful chemicals. Clear-UP is a natural flocculant that causes small particles to be attached to each other, becoming a bigger particle that can be filtered out of the water.. Other clarifiers are made with alum (which contains aluminium) or polyacrylamide, a potentially toxic chemical. Clear-UP does not contain any chemicals.