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Excel and UV

When dosing Excel you need to shut off your UV unit to see any effect. UV light breaks down the chemicals used in Excel. There are several strings regarding this on the site. Stated issues with Fe I have not experienced but doing Excel treatments for algae I have. While running my Aqua UV 8w unit in seven days no effect. Turned off and dosing again BBA and staghorn started turning colors in three days.
 
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