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We don't think too much of those mineral-type systems because they add copper and you do NOT want copper in your water. Contrary to popular belief, it is not chlorine that stains nails, hair and pool surfaces green, it is copper!
Although copper does kill algae and inhibits some bacterial growth, it doesn't kill bacteria fast enough to protect people. It also does not kill viruses.
It is our opinion here on the forum, that the Frog is not a system that we recommend using.
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