CWS Installation, Maintenance & Troubleshooting 2

Question 1

When installing a water softener, the bypass valve should be in which position during the initial startup and brine tank filling?

Accepted Answer

Bypass position

Answer

The bypass valve should be in bypass position during initial setup to prevent untreated water from entering the system before it is properly charged and tested.

Question 2

A customer reports their water softener regenerates every day but water still feels hard. What is the most likely cause?

Accepted Answer

The resin bed is exhausted or fouled

Answer

Resin fouled by iron, chlorine, or other contaminants loses exchange capacity, causing hardness breakthrough even with frequent regeneration.

Question 3

What is the purpose of the air check valve in a brine tank?

Accepted Answer

To stop brine draw when the brine tank reaches a low water level

Answer

The air check (or safety float) stops brine from being drawn into the resin tank once the brine tank water level drops to the preset minimum, preventing air from being pulled into the system.

Question 4

During installation of an RO system, permeate tubing from the membrane housing should be connected to which port?

Accepted Answer

The product water outlet port

Answer

The product (permeate) water outlet port directs purified water to the storage tank, while the reject port sends concentrate to the drain.

Question 5

A UV disinfection system log shows that the UV intensity alarm activated. What is the first corrective action a technician should take?

Accepted Answer

Clean the quartz sleeve

Answer

A fouled quartz sleeve is the most common cause of low UV intensity; cleaning it is the first and least costly corrective step before replacing components.

(CWS) Certified Water Specialist Practice Test

(CWS) Certified Water Specialist Practice Test

CWS Installation, Maintenance & Troubleshooting 2