The Optima C/A was designed to handle the newest trouble issue reefers face today, Chloramine. Also due to popular demand we have added all the features of the Optima Vision, Pro and Automated into one Amazing system, we call the Optima Chloramine Advanced! Not only does this system remove chloramines but check out these amazing features. Built in HM Digital Dual inline TDS meter that lets you check the TDS after the membrane and after the DI with the push of a button! Built in Membrane TDS percent monitor that actually tells you when the RO is producing higher than normal TDS and tells you when it has returned to normal! Auto shut off system built in that shuts the system down when the float valve is engaged.