Understanding the differences between a Plenum and an under-gravel filter.
![](https://i.ytimg.com/vi/MnQgsUumJzw/mqdefault.jpg)
25:03
A Defense of Undergravel Filters
![](https://i.ytimg.com/vi/XoAoLrrxpm4/mqdefault.jpg)
56:10
Why We Broke Up With Under Gravel Filters
![](https://i.ytimg.com/vi/31ZuIsfxArs/mqdefault.jpg)
18:49
My ADVICE for NEW Players in Throne and Liberty
![](https://i.ytimg.com/vi/fn88O7QQvrY/mqdefault.jpg)
1:15:16
Part 8: Understanding How A Plenum Works and Why it works So well :Kevin Novak Ph.D.
![](https://i.ytimg.com/vi/3jhjWZCLufA/mqdefault.jpg)
27:08
Clarification on why some plenums use a lift tube and some don’t. Novak Ph.D.
![](https://i.ytimg.com/vi/-fStGScLjao/mqdefault.jpg)
18:11
How to build a no water change tank part3: ways to make anoxic zones for denitrification
![](https://i.ytimg.com/vi/gTMu-1eY-3g/mqdefault.jpg)
10:49
The Trouble With Substrate.
![](https://i.ytimg.com/vi/lsifl0Avatg/mqdefault.jpg)
13:59