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Yes, bleach can effectively kill nostoc algae. Bleach is a potent disinfectant that can break down the cellular structure of the cyanobacteria, leading to its death. A diluted bleach solution (typically a ratio of 1 part bleach to 10 parts water) can be applied to the nostoc growth on the gravel driveway to eliminate it. However, it is important to use caution when applying bleach. It can harm surrounding plants, soil, and potentially disrupt nearby ecosystems if it runs off into water sources. Bleach should be applied directly to the nostoc mats, and the area should be rinsed thoroughly afterward to reduce any residual bleach. Always follow proper safety guidelines when handling bleach, including wearing gloves and eye protection, and avoid direct inhalation of fumes.