This is a DIY sump filtration system for freshwater as well as marine aquariums,this type of filter can handle large amounts of bio loads,can be easily built by a hobbyist with only a hand full of tools.
Step 1: materials required
1.a box of any kind preferably with a lid[dimensions 8''x4''x5''(lxbxh)]
2.PVC pipe of 1 dia
3.PVC pipe of .5 dia
3.a power head of displacement capacity -300lph
4.filter media.- bio balls,sponge
5.glue of some kind.etc
Step 2: preparing the box
make a hole in the bottom side of the box of dia 1 as shown, sand the edges for better glue bonding,can use any epoxy glue,
make some holes to the lid of the box for air circulation
Step 3: preparing outlet pipe and sump divider
the sump divider and pipe are shown,pipe can be of any desired length,
the divider is cut so that it fits tightly inside the sump,the divider can be of any material here i hav used foam board.
Step 4: assembling
the pipe is fixed , the divider is kept allowing around 1 gap in the bottom for water flow.
glue the stuff.
Step 5: filling with media
fill the compartment near the outlet with biological media like bio balls.and the other chamber with sponge for mechanical filtration
Step 6: sump with bio balls
can see the sump in operation with the lid, a mesh is wound to the outlet tube to avid blocking of outlet by bio balls
Step 7: the complete set up with the pump
the output of the pump is let on the sponge, piping can be clearly seen
enjoy ur new filter!