potable
Straining of plumbing fixtures may be caused by iron concentrations as low as?
0.3 Ppm
The approximate amount of water that a gallon of chlorine bleach at a solution of only 1 ppm will treat is?
10,000 gallons
Most residential pasteurization systems disinfect water at a slow hourly rate, typically____?
20 to 24 gallons per hour
The percentage of impurities removed from water by a distillation system is approximately?
99%
Fine solid particles can be precipitated out of water by adding
Alum
Turbidity in water is commonly treated by using a
Diatomaceous earth filter
Acid in the water can react with copper pipe to leave stains that are
Green
In addition to its disinfectant properties, chlorine also will?
Remove iron and sulfur from water
Water under high pressure is forced through a membrane in a(n)
Reverse osmosis system
Public water utilities use lime in treatment process to remove?
acidity
At the end of each workday, all installed pipes should be___?
capped
Once a water-softener installation is completed, the unit must be?
disinfected
Water hardness is measured in grains per
gallon
Water that contains a high percentage of minerals is called?
hard water
Calcium and magnesium in water are the cause of
hardness
A red, slippery jelly formed on the inside of a toilet is caused by
iron eating bacteria
An activated carbon filter will remove
organic chemicals
The purpose of the quartz sleeve in an ultraviolet-light system is to__?
prevent the water in the disinfecting chamber from cooling the lamp
To treat salty water, the usual method is to install a
reverse osmosis system
Mineral salts dissolved in water form a coating inside pipes that is referred to as___?
scale