They work, but I don't think its the best option for value IMO of course.
they go in order left to right
Pinky Filter, Pet Solutions blue bonded, Drs Foster Smith blue bonded, and Purokleen blue bonded from amazon.
Pinky is the cheapest per ft but it is also the thinnest. It has a totally different type of material on the fine " pink side" then I've seen before. It catches small particles but I think it clogs to quickly in comparison to the others I've tried.
2nd Pet Solutions blue bonded, I think its great! I also think its exactly identical to the Drs Foster Smith brand in each and every way but at less than half the price. This is my favorite bonded media that I've used.
3rd we'll just skip the Drs.F&S nothing against them they still have some things that I regularly purchase at an unbeatable price. This is one of those lessons learned type things.
lastly the amazon offerings. It works its thick it catches everything the price is great especially if you have prime. The downside is just like the pinky that it clogs to fast because it does have such fine offerings.
hope the pictures can help any one sifting through the infinite offerings in bonded material.