The Crystal Cube Plus Floc Blocks by Aussie Gold is a simple and effective solution for maintaining clear pool water all year round. These blocks, each weighing 170g, come with a skimmer sock for easy use. They clarify your pool water, reducing the need for chlorine and preventing algae growth by removing phosphates and algae spores. Suitable for both chlorine and saltwater pools, these non-toxic formulations increase sand filter efficiency. To use, unwrap one blue crystal cube, place it into the provided skimmer sock, and add it to your skimmer box. Tie the end of the sock to prevent the cube from liquefying. Once your filtration system engages, the water will dissolve the crystal cube, clarifying your pool water and lowering its phosphate level. One cube is designed to dissolve over approximately two weeks.