17.
Slow sand. (paras 1-13b(1)(c), (2)(c))
18.
Rapid sand. (para 1-13b(2))
19.
Diatomite. (para 1-13b(4))
20.
To keep diatomite on the fiIter. (para 1-13b(4)(b))
21.
b
(para 1-13b(4))
22.
BoiIing.
Iiodine.
Chlorine. (para 1-15)
23.
BoiIing. (para 1-15a)
24.
Anthracite (hard coal). (para 1-16b)
25.
d, e (para 1-17a(1))
26.
Erdlators. (para 1-17a(2))
27.
Engineer Water Purification Set No.4. (para 1-17b)
28.
Reverse osmosis. (para 1-17c)
29.
Cartridge. (para 1-17c(1)(c))
30.
Gravity. (para 1-19a(1))
31.
direct pressure. (para 1-19a(3))
32. Corps of Engineers. (paras 1-3c, 1-20a)
33.
Dry point. (para 1-20b)
34.
a, c, d, g. (paras 1-20d, e)
35.
DD Form 686
DA Form 1715-R. (paras 1-20a, b).
End of of Lesson 1
MD0160
1-53