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[ MUSIC ]

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>> HI, I'M NASA ASTRONAUT

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DREW FEUSTEL.

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WELCOME TO THE INTERNATIONAL

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SPACE STATION.

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ON OUR STATION,

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OUR WATER RECOVERY SYSTEM

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IS VITAL TO OUR MISSION

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AND OUR SURVIVAL.

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WANT TO KNOW WHY AND HOW

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WE RECYCLE AND FILTER OUR WATER?

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LET'S GO.

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WE USE WATER RECOVERY

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AND FILTRATION BECAUSE

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IT IS EXPENSIVE TO LAUNCH

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RESUPPLY MISSIONS.

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AND THE WEIGHT OF THE WATER

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IS A PROBLEM AS WELL.

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THINK ABOUT THE WEIGHT OF

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A SINGLE BUCKET OF WATER.

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CAN YOU IMAGINE THE WEIGHT

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OF WATER FOR A MONTH'S SUPPLY

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FOR SIX PEOPLE ON

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THE INTERNATIONAL SPACE STATION?

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WHAT ABOUT THE WATER

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FOR A YEAR OR MORE

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WHEN WE LEAVE LOW EARTH ORBIT

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FOR DEEPER SPACE MISSIONS?

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THAT'S A LOT OF WATER,

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AND BRINGING IT WITH US

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IS NOT VERY EFFICIENT.

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ON STATION, WE RECYCLE

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WASTE WATER TO GET

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FRESH DRINKING WATER.

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THIS RECOVERY AND FILTRATION

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PROCESS INCLUDES OUR URINE,

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THE MOISTURE WE EXHALE,

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AND SWEAT, ALONG WITH

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THE WATER WE USE

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TO BATHE AND SHAVE.

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IT WORKS LIKE THIS.

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WHEN WE USE THE BATHROOM,

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URINE IS COLLECTED AND PUMPED

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TO A DISTILLATION ASSEMBLY.

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THE ASSEMBLY SPINS,

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PULLING THE URINE TO ITS WALLS.

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THE URINE IS HEATED

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TO EVAPORATE WATER FROM

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THE WASTE, AND THEN CONDENSED

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IN THE OUTER CHAMBER

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TO FORM DISTILLATE.

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NEXT, THE WATER IS PUMPED

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TO A TANK WHERE IT IS JOINED

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WITH THE WATER RECOVERED FROM

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CABIN AIR CREATED BY

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CREW SWEAT AND RESPIRATION.

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DOWN THE LINE FROM THERE,

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ODORS AND ANY OTHER CONTAMINANTS

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ARE REMOVED WITH HEAT.

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THEN IODINE IS ADDED

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FOR MICROBIAL CONTROL.

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OUR WATER IS CHECKED OFTEN

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TO ENSURE IT MEETS

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WATER QUALITY REQUIREMENT.

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IT IS ALSO MONITORED CLOSELY

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FOR BACTERIA, POLLUTANTS,

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AND PROPER pH.

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THE pH SCALE RANGES FROM

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0 TO 14, AND IS A TOOL USED

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BY SCIENTISTS TO MEASURE

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THE STRENGTH OF AN ACID

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OR A BASE.

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OUR WATER IS REQUIRED TO BE

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IN THE 6.0 TO 8.5 RANGE.

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THE END RESULT OF THE ENTIRE

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PROCESS IS CLEAN DRINKING WATER

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THAT WE GET TO ENJOY

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EVERY DAY.

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THE RECYCLED WATER ON

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THE SPACE STATION IS STERILE.

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THERE'S NO ODOR OR BAD TASTE.

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YOU'VE SEEN THAT

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WATER RECYCLING IS CRITICAL

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FOR LONG DURATION MISSIONS

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SUCH AS HERE ON

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THE SPACE STATION,

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AND WILL BE FOR FUTURE TRIPS

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TO THE MOON OR MARS.

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BE SURE TO CHECK OUT

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THE ACTIVITY CONNECTED TO

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THIS VIDEO SO YOU CAN LEARN

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MORE ABOUT WATER FILTRATION.

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THANKS FOR LEARNING WITH ME,