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Abstract [Objective] The objective was to verify the effectiveness of synthesized membranes derived from horsetail, nopal, moringa seed, tamarind seed, and from mixtures of these four species in the desalination–purification process of brackish water. [Methodology] Four plant species were selected to evaluate their efficiency in water treatment: Horsetail (Equisetum giganteum), Tamarind (Tamarindus indica), Moringa (Moringa oleifera), and Nopal (Opuntia ficus-indica). These species were physiochemically characterized in accordance with COVENIN standards for pH, moisture content, ash, fat, and conductivity. Brackish water sourced from the Santa Teresa well, Puerto Cumarebo, Falcón State, was also analyzed. Statistical analysis was performed using Minitab 17® software, and Tukey’s comparison test was applied with a p-value (p ≥ 0.05). [Results] Among the properties of greatest interest, the low moisture content observed in moringa (5.21%) and tamarind (9.27%) stands out. The plant material was processed to obtain silica (horsetail), tamarind flour, calcium carbonate (moringa), and nopal mucilage, giving rise to the vegetable membranes. Once the water was treated using the synthesized product, analyses of chlorides, calcium hardness, total alkalinity, phenolphthalein alkalinity, total solids, suspended solids, dissolved solids, conductivity, and pH were carried out.[Conclusion] The moringa membrane can be used as a purifier for brackish water, as it showed the best performance compared to horsetail, tamarind, and nopal membranes. Therefore, the use of moringa-based membranes is concluded and recommended.