The best replacement for kio3 is ki.

The best alternatives to kio3 are rated as following:
★★★★★  ki

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Speaking about kio3, one probably shouldn't forget about thiosulfate.

Other search terms related to kio3 and their ratings are:
★★★★★ thiosulfate
★★★★★ na2s2o3
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Google Trends

Scale is based on the average worldwide traffic of kio3 in all years. Click on graph for more.
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