Hole positions for doc biofilter

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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

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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.
 

koiguy1969

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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.
 

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