GL yapereka maunyolo ofunikira ochizira madzi pazida zosiyanasiyana zotsuka madzi, zomwe zitha kugwiritsidwa ntchito popanga zida zopangira madzi kuphatikiza kukonza madzi, mchenga wa mchenga wa sediment box, preliminary sedimentation and secondary sedimentation. Pofuna kukwaniritsa zofunikira pazida zosiyanasiyana zochizira madzi, GL sangangopereka maunyolo opangira madzi opangidwa ndi chitsulo chosapanga dzimbiri komanso chitsulo chapadera cha aloyi, komanso kupereka unyolo wopangidwa ndi madzi opangira madzi. Zinthuzo zitha kukhala 300,400,600 mndandanda wazitsulo zosapanga dzimbiri.