NC-901,NC-902,NC-904,NC-906,NC-912,NC-921 belong to quaternary ammonium salt biocides, and are non-oxide biocides.

Compared with Oxide biocides such as chloride, they possess the following merits:

(1)In the chloride-uncontrollable systems, this series of products could control the reprodubility of algae and increase of sludge.

(2)In different PH range, their bactericidal effects are always effective. In acid or alkali conditions, it also can be used.

(3) They have dispersion and penetration effects, and can penetrate and remove the sludges and the inserted algae. It can be used for removing the grease and cleaning the sludge.

(4)It won't result in accumulation toxicity, and won't make remaining chloride just as treated with chloride, thus enabling them free from twice pollution.