Is purifying the dividends received the only thing to do in order to get halal income?

Assalamualaikum wa rahmatullahi wa barakatuh,

Let’s say that I bought some shares of iShares MSCI World Islamic UCITS ETF. So, is purifying the dividends received the only thing to do in order to get halal income? Like, doing the calculation by looking out the purification amount/figures in the table of purification (Purification Data) which they have provided.

Jazak Allah khair! May Allah reward us all the highest level of paradise!

Wasalam

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Regards