Iplanti encane yokuhlanza indle – iyunithi yokuhlanza indle yasendlini ye-LD, umthamo wokuhlanza nsuku zonke ongu-0.3-0.5m3/d, omncane futhi ovumelana nezimo, ukonga indawo yaphansi. I-STP ihlangabezana nezidingo zokulahlwa kwendle ezindlini zemindeni, izindawo ezinhle, izindlu zangasese, izindlu zangasese kanye nezinye izimo, kunciphisa kakhulu ingcindezi endaweni yamanzi.