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AquaTerra Spa Filter Care: How to Remove, Clean, and Replace a Screw-In Filter Cartridge If there is one maintenance task that makes the biggest difference in how your AquaTerra spa looks, feels, and runs, it is filter care. The filter catches the hair, skin cells, lotion, and debris that would otherwise cloud the water, and it protects the pump by keeping that debris out of the plumbing. AquaTerra spas use a screw-in filter cartridge that is easy to remove once you know how, and a simple monthl … read more