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These minerals in water can cause some everyday problems . There can be no rule of law regulating the weight to be given to seamen 's evidence . Wedges also come in a variety of finishes like the traditional chrome or in black nickel , nickel , rusty , oil can , or beryllium copper . On this subject there can be no call for any such movement ; on the contrary , I fully believe that any public and strong action would do harm , and that we must be satisfied to labor in the less easy and less exciting task of gradual improvement , and abide the issue of things working slowly together for good . Acidic ground water can also be caused by the above factors but is mostly controlled naturally by the equilibrium relationship with surrounding minerals . If the main cause of water corrosiveness is low pH ( acidity ) , the water can be neutralized using special filters containing such materials as calcium carbonate ( calcite ) or magnesium oxide ( magnesia ) . Poor quality water can create more problems in micro-irrigation than in sprinkler irrigation . Chlorinated water can have elevated organic halide levels , commonly trihalomethanes ( MCL = 0.1 mg / l ) . When used in conjunction with a small ( 5 " screen ) video monitor or TV , held-held cameras can be highly portable . Patently , the performances on the stage on this particular night were an artistic shambles , and there can have been little joy among the players , but the gods undoubtedly obtained their fill of amusement . [ Footnote 11 ] Officials cautioned , however , that there can be difficulties in the use of N-95 respirators .