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The 5-minute duration every hour strikes a balance between providing the benefits of UV light and avoiding potential harm from excessive exposure
so you don't have to discard the entire pen when the probe reaches its end of life
Small amounts of micro-particles are occasionally visible in some conditions but will not affect mineral balance or system compatibility
or a couple of them
Sierra Natural Science 217 Spider Mite Control Ready-to-Use, 4 Ounces and Cutters The 5-minute duration every hourSierra Natural Science 217C Spider Mite Control Ready to Use kills spider mites, broad mites, russet mites and their eggs. How our Spider Mite Control works Spider mites destroy plant cells by sucking out their contents and 217C unique formula works by providing a barrier which is harmless to the plant, but fatal to the mites. 217C kills the spider mites eggs and kills the life cycle by coating the eggs with an oily shield that blocks respiration to
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