NSF yog dab tsi?

NSF kom tsis pub muaj teeb meem nrog Chaw Tswj Xyuas Khoom Noj thiab Tshuaj Yeeb lossis Pawg Mis Kas, tab sis nws tshwj xeeb rau National Sanitation Foundation. NSF muaj ob tus qauv tseem ceeb lossis ntawv pov thawj uas peb xav paub txog:

1. NSF 51 - tshwj xeeb rau kev thov zaub mov noj thiab dej haus.

2. NSF 61 - tshwj xeeb rau cov dej muaj peev xwm.

Nrog NSF thiab ntau yam kev sim uas yuav tsum tau ua kom tau raws li kev pom zoo, NSF ua qhov kev sim thiab qhov tseeb, ua pov thawj rau cov tebchaw, rau cov khoom siv rau lawv cov qauv.