The best replacement for circular polarizer is linear polarizer.

The best alternatives to circular polarizer are rated as following:

★★★★★	linear polarizer
★★★★★	uv filter
★★★★★	linear
★★★	neutral density
★★	polarizer
★★	nd filter
★	neutral density filter
★	lens hood
	variable nd
	circular polarizer
	hoya

Your alternative for circular polarizer is not listed? Suggest!

Speaking about circular polarizer, one probably shouldn't forget about lens hood.

Other search terms related to circular polarizer and their ratings are:

★★★★★	lens hood
★	uv filter

You have in mind a companion for circular polarizer and it is not yet here? Propose!

Google Trends

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circular polarizer

linear polarizer

uv filter