Lub particle loj ntawm qhov teeb meem tshem tawm yog feem ntau ntawm ob peb mus rau ob peb puas microns. Txhawm rau kawm nws cov tshuaj lom neeg, nws yog feem ntau sib cais los ntawm seawater nrog lub lim membrane nrog cov pore loj ntawm 0.45 microns. Cov teeb meem tshem tawm muaj ob hom organic thiab inorganic Cheebtsam:
(1) Organic Cheebtsam. Feem ntau yog cov khoom siv roj av, kev nthuav tawm thiab cov khoom ua kom tsis haum, muaj li ntawm cellulose, hmoov txhuv nplej siab thiab lwm cov khoom noj carbohydrates, cov protein, lipids thiab chitin.
(2) Cov khoom xyaw ua ke. Xws li quartz, feldspar, carbonate, av nplaum thiab lwm yam ntxhia detritus los ntawm sab av loj, thiab silicate tsim nyob rau hauv cov txheej txheem tshuaj lom neeg ntawm dej hiav txwv.