Editing USS George H. W. Bush (section)

===Environmental===
Environmental upgrades have also been designed into the ship, including a vacuum collection/marine sanitation device (VC/MSD), a new marine sewage system that uses sea water in lieu of fresh water for lower maintenance costs. Many older ships in the U.S.&nbsp;Navy utilize a gravity-driven collection holding and transfer (CHT) system to handle sewage waste. Newer U.S.&nbsp;Navy ships, including now CVN-77, collect sewage waste by vacuum, allowing for greater flexibility in piping installation, smaller pipe sizes overall and reducing water consumption. The collection tanks of ''George H. W. Bush'' were modified to accommodate both the VCHT (Vacuum CHT) equipment and the elements of a marine sanitization device to treat the waste prior to discharge. ''George H. W. Bush'' is the only aircraft carrier in the U.S. Navy to combine the two technologies.

This new VC/MSD driven waste management system has, however, not been without problems. Reports began surfacing immediately after delivery in May 2009 of issues with the ship's toilet system. As of November 2011, the entire system has gone down at least twice, rendering all 423 commodes in the ship's 130 heads inoperable, with many more incidents that have rendered either half of the ship, or sections of the ship, without operating sanitary facilities. In one ship-wide incident, a repair crew spent 35 non-stop hours attempting to return the system to working order. The system is said to suffer breakdowns when inappropriate materials such as feminine hygiene products are flushed down the toilets.<ref>{{cite news|url=http://www.navytimes.com/news/2011/11/navy-carrier-bush-suffers-widespread-toilet-outages-111411w/ |title=Carrier Bush suffers widespread toilet outages – Navy News &#124; News from Afghanistan & Iraq |newspaper=Navy Times |access-date=3 March 2012}}</ref> During a four-month maintenance period in the dock in 2012, anti-clog measures were installed in the ship's toilet disposal systems.<ref>Shapiro, Michael Welles, "Naval Shipyard Tackles Toilet Clogs on the Bush While Ship Is in For Repairs", ''[[Newport News Daily Press]]'', 29 September 2012</ref>