Sangano rezvekurima rinoratidza kuti zvinomera zvinobata mvura nemumidzi. Kubva kuma1960s, nyika dzepamberi tekinoroji dzakadai seUnited States dzakatora nzira yekudzvanya miti yemichero yekudzivirira for:
(1) kudyara kwemapururu
(2) Kudyara kwegadheni nurser
(3) Ramba kusanaya uye nekuchengetedzwa {{1} mushure mekunge maruva anotorwa nemvura,}}.
Indasitiri yepepa: Zvakawanda zvepepa mune yepepa sarudzo inozadzwa mukati mebhokisi remapepa kugoverwa kwegamu mune fiber chimiro chepepa {} imwe} yekuwedzera kweiyo parafin ndeyekuita mari inowanzoitwa uye yakanatswa kuburikidza neyakajairwa emulsified paraffin parizvino iri kugadzirwa seiyo hydrophobic mumiririri wekugadzirwa kwepepa rekudhinda rakapfuura .