hardness in water

residual chlorine in water

turbidity in water

dissolved oxygen in water

only (i)

both (i) and (ii)

both (i) and (iii)

all (i), (ii) and (iii)

calcium carbonate

magnesium carbonate

sodium carbonate

calcium hydroxide

2

5

7

10

standard silica scale

standard cobalt scale

standard platinum scale

platinum cobalt scale