1 9 4 8 ▁the ▁company ▁got ▁involved ▁with ▁the ▁control ▁of ▁water ▁supply ▁install ations ▁with ▁a ▁water ▁res er voir ▁in ▁Les ▁B ren ets . ▁In ▁ 1 9 5 5 , ▁in ▁collaboration ▁with ▁the ▁Comp ag nie ▁des ▁e aux ▁et ▁de ▁l ' oz one ▁the ▁drink ing ▁water ▁supply ▁of ▁the ▁canton ▁psych iat ric ▁hospital ▁in ▁B oud ry ▁in ▁Ne uch ât el ▁was ▁upgrad ed . ▁As ▁a ▁result , ▁the ▁o zon ation ▁of ▁drink ing ▁water ▁became ▁a ▁separate ▁line ▁of ▁business . ▁From ▁ 1 9 7 2 ▁on wards , ▁S aut er ▁o zone ▁install ations ▁were ▁also ▁used ▁to ▁neutral ise ▁od ours ▁in ▁the ▁return ▁air ▁of ▁pur ification ▁plants . ▁The ▁o zon ation ▁business ▁was ▁sold ▁to ▁Christ ▁Water ▁Technology ▁AG ▁around ▁ 1 9 8 0 . ▁ ▁The ▁remaining ▁business ▁for ▁cont rolling ▁water ▁supply ▁install ations ▁was ▁sold ▁to ▁R itt me yer ▁AG ▁in ▁ 1 9 9 6 . ▁ ▁Company ▁logo ▁ ▁References ▁ ▁Liter ature ▁ ▁Christian ▁Br ück ner , ▁Mark us ▁Br ück ner : ▁Aus ▁eig ener ▁Kraft ▁– ▁Rück b lick ▁auf ▁ 1 0 0 ▁Jahre ▁F irm eng esch ichte ▁der ▁Fr . ▁S aut er ▁AG , ▁Bas el , ▁Bas el ▁ 2 0 1 0 , ▁, ▁online , ▁in ▁German ▁( PDF ; ▁ 5 . 0   MB ) ▁ ▁External ▁links ▁▁ ▁Website ▁of ▁the