Hole positions for doc biofilter

[Jrowenole]

Sorry if this has already been mentioned, but should the return line hole be even, higher or lower than the hole for incoming water into the biofilter?

I am trying to follow doc's photos almost exactly.

My return line hole is 2" and my incoming line hole is 1".

Thanks so much!

 

[DrDave]

Sorry if this has already been mentioned, but should the return line hole be even, higher or lower than the hole for incoming water into the biofilter?

I am trying to follow doc's photos almost exactly.

My return line hole is 2" and my incoming line hole is 1".

Thanks so much!

I used a 3/4 bulkhead fitting to bring in my water and had to fabricate a 2" one for the outlet back to the waterfall and pond. I would put the incoming line slightly higher than the water level in the 55 gallon drum to prevent any possible leak at the fitting.

 

[Jrowenole]

Thanks so much Doc!

 

[koiguy1969]

you need not even put an input hole in a barrel filter. put the hose connection right at the top of the down pipe....if it developes a leak it will leak into the filter not on to the ground.