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Discussion Starter · #1 ·
Im ordering parts so i was wondering is the elbow on top of contraption needed or is it just there for diffuser to fit better under aquarium? Since my filter is behind aquarium it fits me better to have entering hose in line with pipe, not on 90 angle. tnx
 

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done for fit (imo) Mine are placed inline after the canister.
I have made three of these and like the way they work.
 

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Pictures of my rigged reactor following an Eheim Pro3e 2078 then though an inline heater and returning to the tank.







My reasoning for the modification;

Down flow reactors do just that, they create a downward loop in the plumbing.
This can create a vapor lock trying to prime a cleaned canister.
The small ball valve on the upper right of my reactor head is opened over a cup to allow air to vent until water purges all the air from the canister.
Once it spits water I close it and start the filter.

HTH
 
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