Test xxxxxxxx. Test xxxxxxxx shall contain at least one liter of test solution. Test xxxxxxxx made of stain- less steel should be welded, not sol- dered. Test xxxxxxxx made of glass should be glued using clear silicone ad- hesive. As little adhesive as possible should be left exposed in the interior of the chamber. A substrate, such as a bent piece of stainless steel screen, should be placed on the bottom of each test chamber to provide cover for the gammarids.
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