One method of extracting uranium from seawater is using a uranium-specific nonwoven fabric as an adsorbent. The total amount of uranium recovered from three collection boxes containing 350 kg of fabric was >1 kg of yellowcake after 240 days of submersion in the ocean.[18] According to the OECD, uranium may be extracted from seawater using this method for about $300/kg-U.[19] The experiment by Seko et al. was repeated by Tamada et al. in 2006.