The best replacement for sodium polyacrylate is polyacrylamide.

The best alternatives to sodium polyacrylate are rated as following:
★★★★★  polyacrylamide

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Speaking about sodium polyacrylate, one probably shouldn't forget about diapers.

Other search terms related to sodium polyacrylate and their ratings are:
★★★★★ diapers
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sodium polyacrylate
polyacrylamide