How to build a cheap DIY Canister filter for fish tank at home:

Aquarium filters are very expensive & they may not suit your tank size, especially, if you have a large tank. Aquarists make filters at home that are according to their tank specifications.

It is very easy to build a homemade canister filter. A food container, vinyl tube, connectors, filter media & a pump is required for it. A DIY canister filter must have an intake & outtake hose, & it is very important to ensure that your container is leak free. It is very easy to test if your container is airtight or not. Just open the lid of the container & fill it with water. Then put on the lid, invert the container & check if water is leaking or not. In case it is leak free then you can use it for building a cheap canister filter. Canister filters are normally designed for large aquariums but it can work with small aquariums too. Use a low power submersible pump & a small container if you want to make a canister filter for a small fish tank.

In this tutorial we will help you in building a canister filter at home that suits your tank size & requirements.

 

Steps: How to make a homemade canister filter:

Choose a hose for intake. The hose should fit your pump head. When choosing a pump, it is important to choose one that is able to pump double as much water in an hour as the total water in your fish tank.

Watch video which shows how to build a DIY canister filter:


Build a Low Price DIY Canister Filter for Aquarium


I am using a plastic container for building a DIY canister filter. 10mm vinyl tube can be used for inlet / outlet hose. It will draw water containing fish waste, dirt, & other debris to flow into the canister filter. An internal hose will take water to the bottom of the filter. Then water will rise upward & hit mechanical & biological media, & finally clean water will be pumped back to the aquarium.

I am using elbow connectors for making intake / outtake tubes just like the one that are used with canister filters. I am using a vinyl joiner as an intake / outtake valve just like canister filter inflow / outflow connectors. I drilled separate holes for inlet / outlet vinyl joiners & applied silicone glue for leak proof connections. A pump is attached to the inward of the canister which creates a strong suction force for drawing dirty water from the aquarium & pumping clean water back to the aquarium. I have drilled a hole in the lid for the power cable of a submersible pump, & have passed the wire through the hole. Glue is applied to the wire to make it leak proof.

I am using coarse & fine foams for mechanical filtration media along with Zeolite as bio media. Bio media will allow heaps of beneficial bacteria to grow on its surface. Now take a closer look at how I made this cheap DIY canister filter for betta aquarium.

 

Materials:

Materials used in making a homemade canister filter:

  • Food container
  • 10mm Vinyl tube
  • Vinyl tube joiner
  • Elbow connectors
  • Bio Media: Zeolite Bio Media
  • Mechanical media: coarse & fine foam
  • Submersible Pump

 

Step 1:


Mark inlet & outlet connections
Mark inlet & outlet connections

2 holes are marked for inflow & outflow in the plastic container lid. Try not to hurt yourself while using a drill machine & do not apply high pressure on the lid because it could crack it. Use a sandpaper for smoothing rough edges.

 

Step 2:


Cutting joiner in half
Cutting joiner in half

I have cut a vinyl tube joiner in half so that I can use it for both inflow / outflow connections.

 

Step 3:


Pump wiring
Pump wiring

I am using a submersible pump for driving the canister filter. Pump specs. are as follows: 4 watts (power), 280 L/H (water flow). Cut the power cable & drill a hole for the power cable in the container lid.

 

Step 4:


Installing submersible water pump
Installing submersible water pump

Use sandpaper for smoothing rough edges. Setup a submersible pump inside the food container & pass the wire through the little hole. It is time to join the power cable.

 

Step 5:


Sealing connections using silicone glue
Sealing connections using silicone glue

Apply silicone glue for sealing connections. Use glue on both the interior & exterior connections for perfect sealing. Wait till the glue dries.

 

Step 6:


Filter tray
Filter tray

I have made a filter tray from a damaged food container. Many holes are drilled in the tray so that water can easily pass through them. I have drilled one large hole for the hose.

 

Step 7:


Setting up a canister filter
Setting up a canister filter

Cut a small hose & attach its first end to the vinyl joiner & second end to the pump. Make hole in the mechanical filtration media, & this internal hose should reach the bottom of the container after passing through the tray.

 

Step 8:


Setting up filter media in a canister filter
Setting up filter media in a canister filter

I am using coarse & fine foams for trapping solid waste particles in the aquarium water. It is very important to put bio media in between coarse & fine foams. Water rising upward from the bottom should hit coarse foam first, then it will flow through the bio media & fine foam.

 

Step 9:


Bio media & aquaone booster balls
Bio media & aquaone booster balls

It is very important to wash the bio media in aquarium water before using it in a filter. Rising will wash all the dirt. New bio media will not hold beneficial bacteria. Either use a cycled media from another established aquarium or use aquapro booster balls for fast growth of good bacteria. Filter tray acts as a cover b/w submersible pump & bio media.

 

Step 10:


Cut hose for intake & outtake
Cut hose for intake & outtake

Use a hose for both inlet / outlet hose. They should be fitted in a fish tank. Use 2 more hoses for external connections. They should connect aquarium intake / outtake to filter intake / outtake.

 

Step 11:


Aquarium intake & outtake hose
Aquarium intake & outtake hose

Elbow connectors should be joined to aquarium intake / outtake hoses. Cut 2 holes both in the intake & outtake hoses for suction cups. Connect both hoses to the tank wall. Use elbow connectors on each side of both inflow / outflow aquarium hoses. The elbow connectors should be connected on both sides of each hose in a way that it forms a Z.

 

Step 12:


DIY Canister filter for fish tank is completed
DIY Canister filter for fish tank is completed

Attach filter outtake to the aquarium output elbow connector, & filter inlet hose to the aquarium inlet elbow connector. It will allow water to move between aquarium & filter. Fill water in the canister filter before powering on the submersible pump. Air bubbles will take some time in clearing up.

 

Zeolite Bio Media:

Zeolite provides lots of surface for the growth of nitrifying bacteria. It will clean your aquarium efficiently, as well as it will offer ion exchange capacity & will be able to chemically stabilize the aquarium water. Other uses of Zeolite bio media include cleaning waste water. It will wipe out turbidness in water & will remove toxic metals.

 

Instructions:

When you run the filter for the first time then it will gather fish poop & other debris. If you are using new bio media then it will take time in cycling & storing useful bacteria. After running the filter, good bacteria will start developing but it will take some time until your filter contains heaps of useful bacteria. It is possible to boost the growth of good bacteria by using aquapro booster balls because it contains numerous good bacteria that slowly releases in the water & spreads on the bio media. Another way is to add cycled media from an already established tank that contains lots of useful bacteria. The advantage of good bacteria is that it consumes organic byproduct of fish waste & clears your aquarium water. 

 

Conclusion:

Canister filters are the best filters that are able to clean large volumes of water quickly & efficiently than any other filter. Building canister filters do not need high resources because you can convert household stuff into a canister filter. Homemade canister filters are customizable & they suit your aquarium size.

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