Design of a Rainwater Based Gravity Filtration System as a Sustainable Clean Water Solution for Household Scale in Kaliandra: Perancangan Sistem Filtrasi Gravitasi Berbasis Air Hujan sebagai Solusi Air Bersih Berkelanjutan Skala Rumah Tangga di Kaliandra. ANDIL Mulawarman J Comm Engag. 2026;3(3):136-142. doi:10.30872/j6v63781