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Offer dŵr RO / Offer Osmosis Gwrthdro
Egwyddor technoleg RO yw, o dan weithred pwysedd osmotig uwch na'r hydoddiant, y bydd offer dŵr RO yn gadael y sylweddau hyn ac ni all dŵr, yn ôl sylweddau eraill, basio trwy'r bilen lled-athraidd.
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