Can you boil water or treat with chlorine/UV to make HAB water safe to drink/use?

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When cyanobacteria contaminate water, the toxins they produce can be present inside the algal cells. Boiling or disinfecting to kill the cells can rupture them and release more toxins into the water, potentially increasing the amount of dissolved toxin rather than eliminating it. Many cyanotoxins are also relatively stable to heat and are not reliably removed by standard disinfection like chlorine or UV treatment. Because of this, simply boiling water or using typical disinfection methods does not guarantee safety and can even worsen the toxin situation. The safest approach is to use an alternate water source if toxins are detected and rely on treatment methods proven to remove or remove such toxins (often involving specialized filtration or adsorption), rather than attempting boiling or standard disinfection to render HAB-affected water safe for drinking or use.