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Why is it recommended to use Cal-Mag Plus with R.O. Water?

Reverse Osmosis (R.O.) water filtration forces water through a series of fine mesh screens removing all contaminants that are too large to pass through the screens. Large Calcium and Magnesium molecules commonly found in tap water are included in this filtration and are also removed from the filtered water. Cal-Mag Plus is therefore recommended for any grower who utilizes R.O. water to return these essential elements back into the water.

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