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Pictures of test tubes with P. rubescens from lake De Kuil after one hour (a), three hours (b) and 24 h (c) exposure to 2 mg Al L−1 PAC + different doses of ballast; 50, 100 or 200 mg LMB L−1. Note that after three hours in the lower ballast doses, cyanobacteria started to float again. After 24 h, most have surfaced again.
