The best replacement for oxalate is calcium phosphate.

The best alternatives to oxalate are rated as following:
★★★★★  calcium phosphate
★★★★★  oxalic acid
★★★★  struvite
★★★★  escitalopram

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Speaking about oxalate, one probably shouldn't forget about potassium permanganate.

Other search terms related to oxalate and their ratings are:
★★★★★ potassium permanganate
★★★★★ permanganate
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oxalate
calcium phosphate
oxalic acid