The best replacement for sinus rinse is neti pot.

The best alternatives to sinus rinse are rated as following:
★★★★★  neti pot
★  sinugator

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Speaking about sinus rinse, one probably shouldn't forget about tap water.

Other search terms related to sinus rinse and their ratings are:
★★★★★ tap water
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sinus rinse
neti pot
sinugator