<a href=showthread.php?s=&postid=7138601#post7138601 target=_blank>Originally posted</a> by ChemE
Hold an empty plastic bag of known volume underwater so that it gets 100% of the flow the mod puts out. Start the mod, and note how long it takes to fill the bag. This is how it is done by Tunze, and how the mods have been tested.
Just curious,
Where did you read this is how Tunze does it?