4 Pack Rite Size C Aquarium Filter Cartridges Compatible with Marineland Penguin PRO Power Filters 275/375 & Original Penguin Power Filters 200/350, EZ Change #3 Replacement Filter Cartridges

They work great. Very satified.

I chose to buy these over the name brand and I’m so glad I did because it’s a better filter at a reasonable and cheaper price over the name brands. The blue filter is high quality with more carbon than the expensive one, and they fit snug in the slots where as the brand filter matching the same brand filter, it’s loose firing. Therefore don’t waste your time on a name and grab these and forget about clean tank water because it’s already clear.

Size C. Aquarium filters. I like these filters as when I wet them charcoal does not fall out the back. The dust comes out as expected but charcoal does not. They work as good as the name brand. They fit well and they're quality made. This is my new go-to. They are half the price of the ones I find in the pet store.

Quality product and reasonably priced. My tank was cloudy as I hadn't purchased the filters for the pump. An hour after installing the filters, the water was much, much, clearer. I recommend these filters.

Good, typical quality... good price in bulk.