こう性能 せいのう減水 げんすい ざいじゃありませんでした
kōseino ugen suizaijārimasendeshita

Noun
Desu Copula

The polite, past negative form of 高性能減水剤

1. Was not a high-performance water reducer.; Was not a high-performance admixture.

Past/Perfective
Negative
Polite
Terminal Form