Since a decade few shrimp farmers from Tamil Nadu and most of the farmers from Andhra Pradesh of India are utilising bore well waters for shrimp farming. Most of the times these waters are in high in calcium that may lead to mineral deposition on carapace, delayed molting and stunted growth of the shrimp. In Aquaculture its a regular practice to use chelators like EDTA to reduce hardness and calcium levels in water. In the present study an attempt has been made to decrease the calcium levels of bore water using EDTA at different concentrations at different time intervals for different salinities. The results have shown that the EDTA used for the study has been shown to be worth use at 1.5 ppm concentration for the selected salinities. Potential decrease in pH was observed at low salinities with 1.5 and 2ppm EDTA and same is the case with Alkalinities with 2ppm. The calcium and magnesium were found to decrease with 1.5 and 2ppm for 15 to 25 salinities 3hrs after the application and much change was not seen after 24 hrs and same is with the hardness.
