Plenums

[northwest rick]

How many of you are using plenums in your system?
If not why?

 

[marcandkelly]

What are plenums?

 

[northwest rick]

A plenum is basically an under-gravel filter that has been capped (shut off). It creates a dead space of water below the sand which removes nitrate from the water. It also adds calcium (when using aragonite sand) to the water provides some positive buffering.
Link: <a href="http://saltaquarium.about.com/gi/dynamic/offsite.htm?site=http%3A%2F%2Farchimedes.galilei.com%2Fraiar%2Feggshell.html" target="_blank">http://saltaquarium.about.com/gi/dynamic/offsite.htm?site=http%3A%2F%2Farchimedes.galilei.com%2Fraiar%2Feggshell.html</a>