Lime can be used to lower heavy metals on food. It has a citric acid that can react to metal ions. The shells became bioindicators of pollution of aquatic environment especially heavy metals, because it has the ability to accumulate foreign objects. To anticipate this, a heavy metal decline can be done by natural soaking with lime. The purpose of this study is to analyze the effectiveness of lime solution in reduction Pb content in axle shells. The research is pure experimental study with an approach of model Pretest-posttest control group design. This research uses a variation of concentration (10%, 15% and 20%) and variation in the length of soaking time (5 minute, 10 minute, and 20 minute). The replication treatment is performed 3 times repetition. The data collection techniques obtained from laboratory test results. Analysis using ANOVA acuquired a significant value of <0,05 which demonstrates a significant effect on decreasing Pb levels, continued with LDS a decrease Pb in shells at a concentration of 10% and 15% as great as 0,17 mg/100gr; 10% and 20% as great as 0, 29 mg/; 15% and 20% as great as 0,12 mg/100gr. The average Pb level on soaking the lime solution with a variation of concentration and the length of time for in a row is 15%, 26%, 43%, 30%, 52%, 76%, 42%, 68%, 89%. Based on the research it can be concluded, that the most effective optimal reduction in concentration 20% in soaking for 20 minutes was able to lower 89%. Suggestion to the community, soaking lime can be used in a minimum of 15-20 minutes with a comparison of 1 tablespoon/100ml of water and for researchers can use similar research to lower the Cd, Cr and Hg heavy metals on marine biota.