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An Undergravel Filter, sometimes called Under Gravel Filter, works as a biological and mechanical filter. The setup of Undergravel Filters consists of a plastic grate or "filter plate" under the fishtank gravel, allowing water to flow freely under the gravel. Water is drawn through the gravel by power heads or air pumps. The gravel provides mechanical filtration by catching large free-floating particles and the bacteria colonises on the bed provided by the gravel, filter plate, tank bottom and air tubes, acting as a biological filter.

Under Gravel Filters primarily provide biological filtration and are relatively inexpensive, reliable, and very effective.
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Round Under Gravel Filter 19cm diameter
Item # BF22A

Round Under Gravel Filter 19cm diameter

with 1 uptake stem
  • Keeps your aquarium crystal clear by circulating water through the gravel trapping impurities with in the gravel bed and returning clean water to the aquarium.
  • For fresh and ...
More info...
Out of stock
Your Price AU$11.95
Earn 120 points
Modular Under Gravel Filter 16 Plates Kit 24 x 12 inch
Item # AP54

Modular Under Gravel Filter 16 Plates Kit 24 x 12 inch

*** COLOUR MAY VARY *** 1 uptake stem with 56 x 28cm max plate size (photo is for illustration only)
  • Keeps your aquarium crystal clear by circulating water through the gravel trapping impurities with in the gravel bed and returning clean water to the aquarium.
  • For fresh and ...
More info...
Out of stock
Your Price AU$15.95
Earn 160 points
Hailea Under Gravel Filter UF-16P Plates Kit 24 x 12 inch
Item # MF21

Hailea Under Gravel Filter UF-16P Plates Kit 24 x 12 inch

1 uptake stem with 56 x 28cm max plate size
  • Keeps your aquarium crystal clear by circulating water through the gravel trapping impurities with in the gravel bed and returning clean water to the aquarium.
  • For fresh and ...
More info...

 
Your Price AU$22.40
Earn 224 points
Under Gravel Filter 24 Plates Kit 36 x 12 inch
Item # TASMF22

Under Gravel Filter 24 Plates Kit 36 x 12 inch

*** COLOUR MAY VARY *** 1 uptake stem with 84 x 28cm max plate size (photo is for illustration only)
  • Keeps your aquarium crystal clear by circulating water through the gravel trapping impurities with in the gravel bed and returning clean water to the aquarium.
  • For fresh and ...
More info...
Out of stock
Your Price AU$27.25
Earn 272 points
Modular Under Gravel Filter 32 Plates Kit 48 x 12 inch
Item # AP56

Modular Under Gravel Filter 32 Plates Kit 48 x 12 inch

*** COLOUR MAY VARY *** 2 uptake stems with 112 x 28cm max plate size (photo is for illustration only)
  • Keeps your aquarium crystal clear by circulating water through the gravel trapping impurities with in the gravel bed and returning clean water to the aquarium.
  • For fresh and ...
More info...
Out of stock
Your Price AU$26.75
Earn 268 points
Hailea Under Gravel Filter UF-32P Plates Kit 48 x 12 inch
Item # MF23

Hailea Under Gravel Filter UF-32P Plates Kit 48 x 12 inch

2 uptake stems with 112 x 28cm max plate size
  • Keeps your aquarium crystal clear by circulating water through the gravel trapping impurities with in the gravel bed and returning clean water to the aquarium.
  • For fresh and ...
More info...

Your Price AU$37.95
Earn 380 points
Lees Under Gravel Filter 10x20inch
Item # LA80

Lees Under Gravel Filter 10x20inch

9x18 inch plate (13110)
  • Trouble free biological filter with flat plate design
  • Filter plate has more open space which allows for better water circulation
  • Made of a semi-flexible, break resistant ...
More info...
Out of stock
Your Price AU$21.85
Earn 218 points
Lees Under Gravel Filter 12x24inch
Item # LA81

Lees Under Gravel Filter 12x24inch

to suit 24inch tank (13115)
  • Trouble free biological filter with flat plate design
  • Filter plate has more open space which allows for better water circulation
  • Made of a semi-flexible, break resistant ...
More info...

Your Price AU$27.35
Earn 273 points
Lees Under Gravel Filter 12x30inch
Item # LA82

Lees Under Gravel Filter 12x30inch

1 piece 11 x 28 inch (13120)
  • Trouble free biological filter with flat plate design
  • Filter plate has more open space which allows for better water circulation
  • Made of a semi-flexible, break resistant ...
More info...
Out of stock
Your Price AU$33.70
Earn 337 points
Lees Under Gravel Filter 12x36inch
Item # LA83

Lees Under Gravel Filter 12x36inch

86x28cm plate (13125)
  • Trouble free biological filter with flat plate design
  • Filter plate has more open space which allows for better water circulation
  • Made of a semi-flexible, break resistant ...
More info...
Out of stock
Your Price AU$40.00
Earn 400 points
Lees Under Gravel Filter 12x48inch
Item # LA84

Lees Under Gravel Filter 12x48inch

2 pieces 11x21 inch plates (13130)
  • Trouble free biological filter with flat plate design
  • Filter plate has more open space which allows for better water circulation
  • Made of a semi-flexible, break resistant ...
More info...

Your Price AU$48.00
Earn 480 points
 
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