Penn-Plax Cascade 300 Power Filter Replacement Bio Sponge, 2 Pack -Durable Aquarium Filter Media Compatible with Cascade Power Filters -Improves Water Flow & Filtration Efficiency -Black, 7 x 1 x 5 In

Must have and they work as they should

Both sides of the 300 Bio sponge insert provided for in this box, the plastic frame is not included. Order the Carbon media insert seperatly.

I have a aquaflow filter and I needed to replace the bio sponge. This works for me since I also get a spare one for my small economic side filter.

well, kind of...This is the right product and they do a good job but I would like to point out that this is just the sponge portion, not the plastic frame portion (which I evidently needed but in no way can consciously detract any stars from since that is my own fault, not theirs).

very good

Box is open when delivered. Not sure if it is used product.Inferior material but acceptable at this price level.

Exactly what I needed but a 4 star cause it didn't come with the bracket piece

i chose this rating because the item was as described. it had a clear picture and the description was accurate. i would recommend this product to anyone that was in need of said item.

if you want to save your self some money just buy your self some filter media from one of the big box stores and use it should do the same job at half the cost