Babban gilashin karfe ruwan sama tattara tafkin ya yi amfani da kwayoyin gilashin karfe fiber, kwayoyin resin da sauransu high karfi juriya acid alkali kayan da lokaci guda tangled da siffa, haske da ƙarfi, sealability mai kyau, taba leakage. Shigarwa da gini mai sauki da sauri, za a iya amfani da shi don tattara ruwan sama a cikin nau'ikan gine-gine, ajiyar ruwan wuta, adana ruwa da kare muhalli.
Kayayyakin bayanai tare da gilashin karfe septic tafkin, akwai 50-100 cubic da yawa samfuran da za a iya zaɓar, kamar karfin fiye da 100 cubic za a iya amfani da kayayyaki da yawa serial ko m hanyar haɗuwa.