ぎゃく浸透 しんとう まくじゃありませんでした
gyaku shinto umakuja arimasendeshita

Noun
Desu Copula

The polite, past negative form of 逆浸透膜

1. Was not a reverse osmosis membrane.; Was not an RO membrane.

Past/Perfective
Negative
Polite
Terminal Form
Biology