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The Vinyl Liner Blue Stuff - by Jack's Magic |
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- Specifically formulated to prevent stains and scale in your vinyl liner pool.
- Also works great on fiberglass pools!
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http://www.intheswim.com/New-Products/New-Pool-Chemicals-Test-Kits-and-Cleaning-Agents/The-Vinyl-Liner-Blue-Stuff-by-Jacks-Magic/
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