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WaterCheck Tannins Laboratory Water Quality test by National Testing Laboratories will test for tannins in drinking water. FilterWater.com has partnered with NTL to offer this fast and accurate tannin test. The purchase includes the test kit, the laboratory analysis and the lab water quality report. You are responsible for shipment and shipping cost of the water kit to Michigan. Tests take about 5-7 business days. Laboratory Tannin Water Test - Why? Tannins are a natural organic material that can be a byproduct of fermentation and decaying vegetation. Commonly found in ground water in swampy areas or where underground aquifier can be overrun by a swamp. They display a faint yellow, caramel-like color and can cause staining to clothes and laundry. They can also produce a tart after taste or earthy odor. Tannins are considered to be an aesthetical problem.
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