Questions and Answers
1. What is the purpose of nonionic polymers?: Filter aids
2. Where do humic and fulvic acids come from?: Natural Organic Matter (NOM)
decay
3. What can chlorine oxidize?: Iron, manganese, and microorganisms
4. At what pH range does iron react best?: 7.5-8.0
5. At what pH range does manganese oxidation occur best?: 9.0-10.0
6. What is required in a chlorine room with more than one 150-pound
cylinder?-
: High level fans and floor vents
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, 7. What are the characteristics of chlorine?: Greenish-yellow gas, 2.5 times heavier
than air
8. At what frequency should filters be backwashed?: 100-hour run time or 6-10
feet of head loss
9. What is the backwash rate?: 16 gpm/ft2
10. What is the process for softening water?: Sodium zeolite and lime/soda
ash
11. What is used for algae control in large bodies of water?: Copper
sulfate or potassium permanganate
12. What is used to measure sludge?: Sludge Judge or sample taps on clarifier
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