PH value No 1 A bottle of PH value No 2 A bottle of PH value A group(2 bottles)A group of ammonia nitrogen(2 bottles)A group of nitrites(2 bottles)A group of hydrogen sulfide(3 bottles)A group of dissolved oxygen (3 bottles)Residual oxygen (3 bottles) Residual oxygen (3 bottles) Residual oxygen (3 bottles) Residual oxygen (3 bottles) Residual oxygen (3 bottles) Residual oxygen (3 bottles) Residual oxygen (3 bottles) Residual oxygen (3 bottles) Residual oxygen
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