TDS meter

1. What is TDS ?

• a measurement for checking dissolved oxygen

• TDS stands for total dissolved solids

• TDS is a way to measures the water quality

• TDS is a unit that measures biological oxygen uses

1. What units are measured for TDS ?

• PH

• PPM

• DO

• mg/L

What is the range of very bad water for drinking?

• 501++

• 151 - 250

• 1 - 150

• 451 - 500

1. What is our school pond water quality (ppm)

• 1 - 150

• 450 - 600

• 151 - 450

• 600 - 1000

1. What do you think is the best water?( lowest ppm )

• tap water

• bottled water

• filtered water

• 
  canal water

• 
  school pond water

How long does we use to make our own TDS meter

• 6 hours

• 1 hour

• 8 days

• 2 week

1. What is the acceptable TDS level for drinking water?

• 0 - 50

• 51 - 100

• 201 - 300

• 1 - 150

What is the main source of high TDS in water?

• bottled water

• Natural minerals

• tap water

• reverse osmosis water

1. How can we reduce TDS levels in water?

• Boiling

• Filtration

• Adding salt

• Chlorination

What device measure water quality in ppm