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Old 18-02-2010, 01:31 PM   #23
stoner's Avatar
Join Date: Jun 2006
Posts: 2,938

Originally Posted by atom View Post
4x is just nothing more than a guide. You can have 10x but you must have large sump with sufficient biomedia to compensate for the reduced retention period. I prefer high turnover. 6 to 8x will be nice.

An exaggerated example:

The water speeding pass a chamber containing CR at 1000 l/hr, can remove 4 mg/l of ammonia.
When the velocity increases to 2000 l/hr, the chamber can remove 2 mg/l of ammonia.
To compensate for the losses, the water has to pass 2 chambers in order to remove 4 mg/l of ammonia.
A very clear explanation...

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