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

This is a great Instructable, but you need to add a main image of the final project to the intro step. Please do that and leave me a message when you have so that we can publish your work. Thanks!
Excellent Instructable. My question is, It looks like your inflow for the filter and the out flow are on the same side, Wouldn't it be more advantagous to put he inflow over the bio media? It seems like water on that side of the divider wouldn't move much. Or is that what you are trying for?
you cannot "use any epoxy glue". Use only certified aquraium non-toxic glues.
wait for it... wait for it.... ^ OWNED LOL! the guy below is right all epoxy is fine for fish. Great DIY this helped me out a ton thanks
Epoxy itself is aquarium non toxic.
So when making the outlet hole in the box I should also have drilled 1/4inch air (?) holes on the outlet side of the lid and an inlet pipe hole to fit the inlet pipe being used? Does the system need so many air holes? It's a brilliantly simple system, I love it! Off to build one now, from left-overs!
Is the divider purely to keep the bio-balls and the sponge separate? There's a gap then (1cm 1inch?) at the bottom and top?
I think you better call this as &quot;Overhead Filter&quot; :-)<br />
so, are these powerheads submersible, like a fountain pump?
yeah!!!!!!!!!!<br/>the one which u see in pic is a fountain pump <sub> any other pump can also be used which is submersible or not</sub><br/>

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