If you SO3 concentration is ...

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If you SO3 concentration is less than 208 mg/lit then oxidising them to SO4 gives you no problem as the limit for SO4 is 250 mg/lit. Oxidising is the only clean and sure way of getting rid of SO3 without any undesired by-products.

Of course it all depends on your water flowrate.

There is a wide choice of oxidants but I would personally use ozone as any residual O3 reverts naturally to O2 within a certain time limit.   

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