WHAT IS CHEMICAL DOSING DOSING CHEMICALS - L.P. DOSING Hydra zine Hydrate solution, in concentrations of about 0.10 % is used for oxygen scavenging purposes. Sodium Sulphite solution, is also used as oxygen scavenger. Ammonia solution (about 1 - 2 %) is also used, for pH control of feed water. Similarly Morpholine is also used. Caustic Soda solution is also used, for pH control of feed water. Other proprietary chemicals are also available for same purposes. PSI ENGG SYSTEMS P.LTD