A sol-gel method has been widely utilized for membrane fabrication due to low temperatures requirement and high purity. In the application of potable water production, membrane technology also plays an important role applied for brackish water treatment. This study aims to develop a multichannel membrane through an inner coating method and then to demonstrate the membrane performance for brackish water desalination. Two type of organosilica multichannel membranes were fabricated by mixing TEOS as a silica precursor using citric acid catalyst via sol-gel method and pectin as carbon templated. The multichannel membranes were inner-coated up 4 layers and calcined at 175 °C for organosilica multichannel membrane and 300 °C for silica-pectin multichannel membranes in vacuum condition. From FTIR results indicated that organosilica and silica-pectin multichannel membranes show siloxane (Si-O-Si), silanol (Si-OH) and silica-carbon (Si-C) groups. In addition, the organosilica multichannel membrane performed the water flux of 15.74 kg.m-2.h-1and salt rejection of 99.77%, where the silica pectin multichannel membrane performed the lower performance compare to organosilica multichannel membrane (water flux: 11.44 kg.m-2.h-1 and salt rejection: 99.48%). In conclusion, the organosilica multichannel membrane derived from citric acid as catalyst has a better performance compare to organosilica multichannel membrane derived from pectin applied for brackish water treatment. Keywords: organosilica multichannel membrane, inner coating, brackish water treatment

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South Kalimantan-Indonesia is in the Southern part of Borneo which almost half of the population lives in remote areas. Geographically, people are isolated and have poor access to electricity as well as a clean water supply. It is very essential to ensure the availability of clean water produced from peat water to overcome future water shortages. This work performs the fabrication of multi-channel silica-based membranes applied for peat water ultrafiltration which is demonstrated under various transmembrane pressure (TMP) and top layer types. The silica based top layer membranes were fabricated from three different sources (silica-pectin, organosilica, and pure silica) via dipcoating method onto macroporous multi-channel alumina support (4 bore). Peat water was treated by multi-channel membranes through ultrafiltration process through cross flow system. According to the results, all multiples top layer pore size were obtained with range from 2.1 to 6 nm classified as mesoporous membranes. This process exhibited a promising outcome for removal natural organic matter (NOM) about 89-71% (UV254 rejection) at TMP 1-3 bar, respectively. Besides that, normalized permeate fluxes of that membrane excellently stable over 180 min operation time. It is concluded that silica based multichannel membranes are either compatible to treat peat water that has high number of NOM as well as excellent to overcome membrane fouling.