The Atlantic Water Gardens Bio-Rocks is an excellent filter media for biological filtration in all up-flow water filters. Made same surface area as lava rock, but 25% lighter, about half the weight of gravel. It is a less abrasive alternative to heavy-weight bio-media. Contains 0.5 cubic feet, 28 lbs.
- Bags of Bio Rocks Recommended for Atlantic Waterfall Filters
- BF1000 - 1 Bio-Rocks
- BF1250 - 1 Bio-Rocks
- BF1500 - 2 Bio-Rocks
- BF1900 - 2 Bio-Rocks
- BF2600 - 2 Bio-Rocks
- BF3800 - 3 Bio-Rocks