Why do commercial layer farms avoid using deep well water with high Total Dissolved Solids (TDS > 1500 ppm) for brown layers?

Total Dissolved Solids (TDS) measures the combined content of all inorganic and organic substances dissolved in water. For commercial brown layers, using well water with a TDS exceeding 1500 ppm is highly hazardous. High TDS water typically contains high concentrations of sodium ($Na^+$), chloride ($Cl^-$), and sulfate ($SO_4^{2-}$) ions. High sodium and chloride intake overloads the hen's kidneys, forcing them to excrete excess water to flush out the ions. This leads to chronic wet droppings (polyuria) and wet litter, raising shed ammonia. More critically, high blood chloride levels induce systemic metabolic acidosis, which displaces bicarbonate ($HCO_3^-$) ions from the blood. This lack of bicarbonate directly halts the deposition of the calcium carbonate shell matrix in the uterus, resulting in brittle, thin-shelled, and misshapen eggs. Installing a reverse osmosis (RO) desalination plant to drop TDS below 500 ppm is essential to restore performance. Farmers can read hydro-chemistry in the Poultry Encyclopedia, buy industrial RO filtration systems on Poultry Plaza, monitor daily egg rates on Poultry Rates, and trade clean brown eggs on Murghi Mandi.