College of Filtration - Final Exam

Answer the following questions to earn your certificate of completeion of the College of Filtration. When you are finished, fill out the form and we'll send you your Certificate of Completion and/or badge in the mail!

1. Prefilters are :

A) Biological filters that remove debris

B) Screens that remove debris after it goes through the pump

C) Mechanical filters that remove debris before the biofilter

D) Simple screens that keep debris out of the pond

2. The bigger the prefilter is, the ...

A) The more debris will accumulate on it

B) The more clogged it will get

C) The longer it will take to clog

D) The harder it will be to clean

3. Pond skimmers have become very popular because...

A) It's easier to maintain pumps in skimmers

B) It's easier to plumb pumps in skimmers

C) Pump intakes stay cleaner and are less likely to clog in skimmers

D) All of the above

4. TRUE or FALSE. Skimmers can be plumbed to remove fish mulm from ponds.

A) True

B) False

5. Biological filters...

A) Mechanically remove debris from the water column

B) Chemically remove toxic substances from the water

C) Enhance the activity of bacteria

D) Need to be cleaned frequently

E) A and C

F) B and C

6. Nitrifiers are...

A) All of the following

B) Slow-growing bacteria that reduce ammonia

C) Oxygen loving bacteria that increase nitrate levels

D) The only thing that keep fish from poisoning themselves in their own wastes

7. TRUE or FALSE. Most of the biological activity in the pond occurs in the media of the biofilter.

A) True

B) False

8. Upflow Biofilters are likely to:

A) Leak from the bottom

B) Overflow out the back

C) Require seasonal cleaning

D) Clog frequently

9. The same pads used in a skimmer will be less likely to clog in an upflow biofilter because of ...

A) Increased water flow

B) Hydraulic pressure

C) Low water levels

D) Increased biological activity

10. TRUE or FALSE. Pressure Filters only start filtering after 2-6 weeks without any ammonia in the water.

A) True

B) False

11. The term “Ultra Violet Sterilizer” refers to...

A) Sterilizing water

B) Rendering algae sterile

C) Removing algae from water

D) Clarifying water

12. Ultra Violet Sterilizers control algae at the same wavelengths as .

A) The Sun

B) Black Lights

C) Tanning Booths

D) Mercury Vapor Lamps

E) Compact Florescent Lights

13. How much usable wattage at the correct wavelength does a UV lamp rated for 40 Watts actually emit?

A) 40 Watts

B) 30 Watts

C) 20 Watts

D) 10 Watts

E) 4 Watts

14. The main advantage Ionizers have over UV lights is their ability to .

A) Control green water

B) Control invertebrates and amphibians

C) Control copper ions

D) Control string algae

E) Control water hyacinths

15. The maximum concentration of Copper Ions recommended to control algae without harming goldfish is ...

A) 100%

B) 3 parts per million

C) 10%

D) 0.3 parts per million

E) 1%

16. TRUE or FALSE. Unlike UV Sterilizers, Ionizers work better at higher water flows than at lower flows.

A) True

B) False

17. Ionizers work best when water pH is near neutral and buffering moderate because...

A) Low pH makes copper ions less effective

B) High alkalinity makes ions more toxic

C) Lower levels of carbonate hardness cause copper to precipitate

D) All of the above

E) None of the above

18. The best choice of Copper, pH and KOH concentrations for algae control in a goldfish pond with waterlilies would be which of the following?

A) 3ppm, pH 6.7, KOH 60

B) 0.3 ppm, pH 7.6, KOH 240

C) 3ppm, pH 7.0, KOH 200

D) 0.1ppm, pH 7.2, KOH 100

E) 0.3 ppm, pH 6.8, KOH 40

19. An Active Bog installed in a heavily stocked koi pond will ...

A) Control nitrite levels

B) Add decorative platings

C) Control ammonia spikes

D) Keep bacterial levels up

E) All of the above

20. A heavily stocked koi pond that has only an Active Bog for filtration might need it sized to which of the following?

A) 10% of the total surface area of the pond

B) 20% of the total surface area of the pond

C) 40% of the total surface area of the pond

D) 60% of the total surface area of the pond

E) 100% of the total surface area of the pond

College of Filtration Final Exam: