Surface water treatment by using biosand filter and hibiscus rosa sinensis leaves as heavy metal adsorption in Kangkar Senangar’s River, Johor nork Hamidon, Nuramidah, Yahya, Siti Hajar, Mohd Sunar, Norshuhaila, Muhamad, Mimi Suliza, Harun, Hasnida, A. Hamid, Hazren, Ali, R.

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