Mardel Crystal Clear 4oz Aquarium Water Clarifier, Clears Cloudy Water Immediately. Cloudy water is most often caused by the minute dirt and debris particles suspended in the water. These particles can spoil the aquarium’s appearance, harm fish gill membranes and deprive live plants of the essential light needed to grow. Crystal Clear instantly clumps these particles together so they can drop out of suspension in the water and fall to the gravel bed or become large enough to be removed by the aquarium’s filter.
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