A Afirka da Asiya, 750 mutane miliyan basu da wadataccen ruwan sha. Don kawo ruwa ga danginsu, wasu lokuta ana bukatar mata da yara su yi tafiya mai nisa, tsawonsu ya kai kilomita 6, tare da bokitai lita 20 da suke ɗauka a kawunansu. Wannan tsari, banda cin lokaci, shima cutarwa ne ga lafiya, domin yana haifar da matsalar tsoka.
Rollin Ruwa na Hippo abu ne mai ban sha'awa da ban sha'awa azaman mafita mai sauƙi don sauƙaƙe waɗannan matsalolin samun ruwa. Tare da nauyi mai nauyin kilo 10 kawai, ganga mai ruwa a ƙafafun yana ba mutane damar safarar lita 90 na ruwa a wani lokaci, wanda yawanci kusan sau biyar ya fi wanda za a iya ɗauka tare da guga. Wannan yana sa jigilar ruwa cikin sauri da sauƙi.
An yi ganga da wani guda m yanki an yi shi da filastik mai wuya wanda za a iya ɗauka ta cikin ƙasa mafi wahala kuma yana da ikon tsabtace ruwa ta hanyar matattara. Hakanan yana ba da damar amfani da shi don shayarwa don ƙananan lambuna. Tsarin ƙarfe na al'ada yana ba da damar ganga ta juya zuwa ƙafa.
Kowane Hippo Roller an tsara shi don karshe game da shekaru 7 Kuma da zarar rayuwarta mai amfani ta ƙare, ana iya sake yin amfani da shi don wasu abubuwan amfani kamar wanka ko ganga na ajiya don wasu nau'ikan abubuwa.
Wannan injiniyyar injiniyoyin Pettie Petzer da Johan Jonker ne suka kirkiresu wadanda suka girma a gonaki kuma suka fuskanci matsalar ruwa a cikin yankunan karkara kai tsaye. Yanzu kirkirar sa ake yi amfani da shi a cikin ƙasashe 20 a kan nahiyar Afirka kuma akwai rollers 45.000 da aka rarraba wa mutane sama da 300.000 a duniya, gami da Indiya da Kudancin Amurka.
Wani babban abun kirki shine wannan yaron.