Use of 3.6 mg/L (anhydrous) sodium thiosulfate will reduce 1.0 mg chlorine/L (APHA, 1992).
Use of  3.6 mg/L (anhydrous) sodium thiosulfate will reduce levels of 1.0 mg chlorine/L
Use of  3.6 mg/L (anhydrous) sodium thiosulfate has no effect on levels of 1.0 mg chlorine/L.
A young asian couple is outdoors
The girl is wearing a green shirt and holds a red balloon.
The west coast consists of sheer rocky cliffs with no beaches to speak of.
They added to it, effectively making it better than it was before.
A boy walks on the lake shore.
A man is preparing food