Izithwali zimayini ezakhelwe ngokunembile ukuze kugcinwe indawo eyisisekelo ne-positioning yethendon elisisundu, izikhwele, nezinhlaka zekhebuli ngaphakathi kwamasistimu okusikwa amandla okugcinwa njengezintambo nasezikhathweni zomisebenzis wezisekelo ezimbilini. Kukhulu kuvaliwe kubukwa be-polyethylene enamba ephakeme (HDPE), izinzuzo zokuwala ensinqi, noma izinhlaka ezibi zeplastik, izithwali eza njengezingxenyana ezinzima ekusetshenzisweni okutholakala phakathi kwendlela ukuphakamisela ilanga elincane nolwazi olungenziwa ngabase-engineer. Isizathu sakuqala yile indlela ingenamkhawulo kungelamanga, okucacisa umtakatho ogcwele wemenimim ngaphakathi kwendaka, okuvimbela ukuxhumana okungenabizo okunganezela ukulwa nesifo, ukuqina kwesikhombisi-sebenzela, noma ukukhubeka kahle kwesistimu. Eziziphathisazaneni zethendon elisisundu, izithwali zigcina isigameko esikhoqo sokusikwa amandla nokuvikela ithendon yokuvala umonakalo ngezikhathi zosistimu kanye nemali eseqaliwe.
Izithwali zimayini ezakhelwe ngokunembile ukuze kugcinwe indawo eyisisekelo ne-positioning yethendon elisisundu, izikhwele, nezinhlaka zekhebuli ngaphakathi kwamasistimu okusikwa amandla okugcinwa njengezintambo nasezikhathweni zomisebenzis wezisekelo ezimbilini. Kukhulu kuvaliwe kubukwa be-polyethylene enamba ephakeme (HDPE), izinzuzo zokuwala ensinqi, noma izinhlaka ezibi zeplastik, izithwali eza njengezingxenyana ezinzima ekusetshenzisweni okutholakala phakathi kwendlela ukuphakamisela ilanga elincane nolwazi olungenziwa ngabase-engineer. Isizathu sakuqala yile indlela ingenamkhawulo kungelamanga, okucacisa umtakatho ogcwele wemenimim ngaphakathi kwendaka, okuvimbela ukuxhumana okungenabizo okunganezela ukulwa nesifo, ukuqina kwesikhombisi-sebenzela, noma ukukhubeka kahle kwesistimu. Eziziphathisazaneni zethendon elisisundu, izithwali zigcina isigameko esikhoqo sokusikwa amandla nokuvikela ithendon yokuvala umonakalo ngezikhathi zosistimu kanye nemali eseqaliwe.