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Pool First Aid combines powerful concentrated enzymes with an organic clarifier that is ideal for big cleanups. Gets rid of scum-lines, waterline ring, cloudy water, clogged filters and chemical odors with no excessive scrubbing. Pool First Aid will quickly free clogged filters of oils and organic build-up. In most cases, no backwashing is required. Use 1 cap full per 2,000 gallons of water. Use as needed.