Understanding the differences between a Plenum and an under-gravel filter.
18:47
The difference between an under-gravel filter and a Plenum also a dirt-magnet and a sponge-filter.
27:08
Clarification on why some plenums use a lift tube and some don’t. Novak Ph.D.
23:50
What really happened to the under-gravel filter? Why did it fall out of favor?
25:03
A Defense of Undergravel Filters
10:36
Dieter Nuhr GENIALE Wahlempfehlung 📢 So PEINLICH ist die Politik 🤡
13:59
Charging DIY Substrates like Safe-T-Sorb - preparing an Anoxic Filtration Aquarium
56:10
Why We Broke Up With Under Gravel Filters
15:46