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Understanding Limelight's Two-Filter Design: How It Works and How to Maintain It Hot Spring's Limelight Collection spas use a filtration approach that is a little different from a standard single-filter spa, and understanding why can save you some confusion the first time you go looking for a replacement cartridge. Rather than running all your water through one filter, Limelight models split the job between two dedicated filters, each handling a different part of the spa's circulation. This guid … read more