Unique mvura kubva isingawanzowanikwi dhipoziti makore mamiriyoni 70 okuberekwa. Kwayakabva kune alkaline zvishoma ine pH ye7.4. Zvinoenderana neongororo, haina kusangana neyepamusoro chemistry mumakore makumi matanhatu nemashanu. Inosangana nemitemo yakasimba yemvura yemwana kubva pasi. Iine isingawanzo silicic acid. Iyo ine yakaderera kwazvo COD index.