Whisper Jr filters fit my smaller aquarium. It does an excellent job of trapping nasty waste from the tank.
Very easy to replace. I like Whisper products very much.

Pros: very durable

Cons: none

We do not currently have a fish tank, but have had several sizes ranging from small to large over the years. We have used many of whisper's products, including the biobags and we have no complaints. They were high quality and easy to use.

Pros: easy to use

Cons: unknown

These are great! They are all in one and we used to use them for our saltwater tank.

They come in boxes of 6 and they are easy to use, just pull out the whole thing from the tank and pop in the fresh one!

They work very well!

Pros: Great!

Cons: none

I only buy bio-bags for my turtles, but either they're terribly messy or these bags just don't last as long as I'd like. To keep the tank really clean and not too smelly, it needs to be replaced almost every week and a half, or two.

Pros: So simple a monkey could do it

Cons: Don't last too long

I used these in my 10 gallon tanks. Very easy to use and keeps the water clean.

Pros: They are very effective

Cons: none