Review on 🐟 Optimized BioGravel Filter Media for Aquariums by Kristin Anderson

This is the best there is, but you won't get much bang for your buck. I wish I could measure, but I'd say about 2 US cups of gravel. I searched Youtube for my #49 Pondguru filter to update the BiOrb filter so I don't have to use the sharp ceramic backing that BiOrbs come with. I have a 4 gallon tank and after cutting out the pond foam and placing it in my tank I poured a 2 pound sack in and it wasn't enough. I have just ordered a second bag which does the job. This substrate is expensive but from what I've read it's worth it with good bacteria and filtration, great for shrimp and plants. It is impossible to get a clean aquarium with a BiOrbs substrate and I have seen many fish and shrimp because cleaning a ceramic backed substrate becomes a nightmare. Why isn't BiOrb doing it right?