âCode Redâ âCode Blueâ, âCode Blackââ¦people sometimes wonder what these terms mean if they happen to hear them used in a hospital (or more likely, hear them used on a TV series about doctors).his Site Might Help You. RE: what do the hospital color codes mean? Are they generally the same in every hospital? for instance, in our local hospital I have heard the colors; pink, brown, gray, white, yellow, red, and of course, blue.
Re-Use Waste from Reverse Osmosis (RO) Filter. Many of us use Reverse Osmosis Filters (RO filters) to purify Drinking Water, in areas with high TDS (Total Dissolved Salts) content in the Water. Around 75% of the Water fed into a RO filter, is wasted. Only 25% gets extracted as drinking Water.
Water filters like the one shown in Figure 4.4.1 can be used to remove impurities in areas where this is a problem. Some people use filters to clean their water of impurities. Figure 4.4.1 Water world 98% of the worldâs water is salt water in the oceans. 77% of all fresh water is ice in Antarctica. SciFile Water sources Many of the major water sources for Australiaâs towns are lakes, rivers (such as the one shown in Figure 4.4.2) and water from below the ground.