A brine tank is a container used primarily in water treatment systems, particularly for water softening and filtration processes.
 
Its main functions include:
1. Brine Solution Preparation: The brine tank holds a concentrated solution of salt (sodium chloride) dissolved in water. This solution is used to regenerate ion exchange resins in water softeners.
 
2. Regeneration of Ion Exchange Resins: During the water softening process, hardness minerals (such as calcium and magnesium) are exchanged for sodium ions in the resin beads. Over time, the resin becomes saturated with hardness minerals and loses its effectiveness. The brine solution is used to flush out these minerals and replenish the resin with sodium ions, restoring its ability to soften water.
 
3. Water Conditioning: In systems that require demineralization, the brine tank may be part of a larger setup that conditions water to meet specific quality standards, providing softened or demineralized water for household or industrial use.
 
4. Preventing Corrosion: In some cases, the brine tank also plays a role in maintaining the operational efficiency of water systems by preventing scale buildup and corrosion in pipes and appliances. 
Overall, the brine tank is a crucial component of systems designed to improve water quality for various applications, including residential, agricultural, and industrial uses.