nanofiltration, a membrane separation technique which is looser than reverse osmosis and tighter than ultrafiltration but is not legally permitted for use with wine.
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Wollan, D., ‘Membrane and other techniques for the management of wine composition’, in A. G. Reynolds (ed.), Managing Wine Quality 2: Oenology and Wine Quality (Cambridge, 2010), 133–63.
© Jancis Robinson and Oxford University Press 1994, 1999, 2006, 2015