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Letter posted by Lescarpentier over on TPT.
http://www.plantedtank.net/forums/equipment/64679-reducing-output-2217-letter-ernesto.html
Check this out also...
This experiment was done by Lescarpetier over on TPT (it may have been posted here as well.) You can also cut off half of the impeller blades, or change out the 2217 impeller with a 2215 and it will reduce the flow
http://www.plantedtank.net/forums/equipment/64679-reducing-output-2217-letter-ernesto.html
Check this out also...
This experiment was done by Lescarpetier over on TPT (it may have been posted here as well.) You can also cut off half of the impeller blades, or change out the 2217 impeller with a 2215 and it will reduce the flow