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As summer is winding down, these replacement pool filter cartridges are being cleared out at a throwaway price of ~$ 55.

https://www.amazon.com/gp/product/B002860AJA

I have a set for an year. Ordered one more. Easy to clean. Rinse them and then dip them in cleaning solution(bio-dex etc.) for few hours to use for another 3 months or so.