CWS Point-of-Use vs Point-of-Entry Systems 2

Question 1

A homeowner wants to protect only the water used for drinking and cooking. Which system type is most appropriate?

Accepted Answer

Point-of-use system

Answer

Point-of-use systems treat water at a single outlet, making them ideal when only drinking and cooking water requires treatment.

Question 2

Which POE system type is most commonly used to remove iron and manganese from a private well supply?

Accepted Answer

Oxidizing filter with backwash

Answer

Oxidizing backwash filters (e.g., greensand or Birm) oxidize and filter iron and manganese from the entire water supply at the entry point.

Question 3

A POU reverse osmosis unit produces permeate at a typical recovery rate of:

Accepted Answer

15–35%

Answer

Most residential POU RO systems recover 15–35% of feed water as product water, rejecting the rest as concentrate drain water.

Question 4

When a POE softener is installed before a water heater, the primary benefit is:

Accepted Answer

Preventing scale buildup inside the water heater and pipes

Answer

Softening hard water before it enters the water heater prevents calcium carbonate scale from depositing inside the tank and heating elements.

Question 5

A POU ultraviolet system installed under a kitchen sink protects against:

Accepted Answer

Microbial contamination in the water dispensed at that point

Answer

A POU UV unit disinfects water at the specific outlet where it is installed, inactivating bacteria and viruses in that stream only.

(CWS) Certified Water Specialist Practice Test