こう性能 せいのう減水 げんすい ざいじゃなかったです
kōseino ugen suizaijanakattadesu

Noun
Desu Copula

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

1. Wasn't a high-performance water reducer.; Wasn't a high-performance admixture.

Past/Perfective
Negative
Polite
Casual Register