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一忌选用失效药有些药品存放期过长或保管不善而失效或变质，泼洒后不仅无作用，有时还会造成危害。使用前要仔细检验药剂是否变质或受潮失效。通常情况下，漂白粉呈于燥粉末状，硫酸铜呈草绿色，生石灰是块状是未变质的。二忌随意混合泼洒多种药当鱼同时发生几种病时，要避免?
Avoid the use of invalid drugs Some drugs shelf life is too long or inadvertently failure or spoilage, after the spill is not only no effect, and sometimes cause harm. Carefully test before using the agent deterioration or moisture failure. Usually, the bleaching powder is in the form of a dry powder, the copper sulphate is greenish-green, and the quicklime is massive without deterioration. Second, avoid mixing a variety of medicine randomly mixed When the fish at the same time several diseases, to be avoided?