CleanTech Lithium (AIM: CTL) has produced high-purity lithium carbonate grading up to 99.75% Li₂CO₃ from brine sourced at its flagship Laguna Verde project in Chile, providing further technical validation of its Direct Lithium Extraction process as the project advances towards Definitive Feasibility Study. The pilot programme processed 24 cubic metres of Laguna Verde brine through the proposed flowsheet, with key DLE adsorption parameters outperforming the assumptions used in the PFS and supporting the planned 15,000-tonne-per-year production capacity. Importantly, the nanofiltration stage achieved 99.8% magnesium and 95% calcium rejection while recovering 98.3% of the lithium. The programme ultimately produced 5kg of lithium carbonate, with independent assays returning purities between 99.69% and 99.75%, giving CleanTech further engineering data to optimise and de-risk the process ahead of final project design.@ctlithium