A device used to inject a chemical solution into wastewater during water treatment.Ejectors are presently used on a widespread basis in marine applications for the purposes of treating water for their incredibly high suction capabilities and dependability. Generally, liquid-gas ejectors utilize ballast water purification as its first and foremost fluid while its secondary fluid is the chemical zone. Ejectors are used in other applications such as water softeners and deionizers. In water softener ejectors work to suck the brine solution from the salt tank, and in deionizer it sucks the caustic and acid for the regeneration process.