Review on 🐧 Marineland 24-Pack Penguin Rite Cartridge Set by Jason Valencia

These are standard black frame filters with filament filter on one side only, sold in packs of six at most pet stores. This is actually what was sent to me, there were 4 boxes of 6. Black edge filters work well but I find they are too densely filled with carbon in the center and barely visible from above and below. /Marineland-Rite-Size-Cartridge-B-6-Pack/dp/B001LISOLM "However, they work quite well and do the job I bought them for. Just don't be surprised when you receive your package and find something- it is very different from what is shown in the picture.