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Pond Medic Algae Straw works by releasing natural microorganisms and chemicals that stop algae and blanket weed growth. Its special composition gives it a large surface area for better water/oxygen access and even chemical/microorganism distribution. Algae Straw takes 2-4 weeks to become effective depending on water temperature and may work for up to 3 months. For larger ponds, use multiple bundles in distinct areas. Algicides must not be used with Algae Straw around - instead, move it to a bucket of untreated pond water and wait two weeks before reintroducing. Avoid letting the straw sink to the bottom or totally decompose as this can contaminate the water. Follow these easy steps for use: Calculate the pond's gross capacity (in liters/imperial gallons). Each 50g bundle treats up to 4,500 litres/1,000 imperial gallons. Float Algae Straw in an area with circulation/high oxygen levels. Anchor it, replace every 3 months, and add new