Kept the water clean

These filters came fast and they clean the water very good

Mopani driftwood seems to really stain the water, even after bleaching

Keeps my betta's water nice and clean, not to mention the filter these cartridges is really quiet and low-flow, my betta is very happy with this setup.

keeps water clean and fits my filter perfectly.

My betta fish loves the clean water!

Takes a couple days to clear up the water but does the job

After two weeks, instead of just tossing away the old one, i run it through cold running water and rub off any debris and use it for another week or so

Easy to change and reduced the amount of water changes/ deep cleaning

Keep water relatively clean

Keeps the water cleaner.

The plants hide the pot and the filter helps to keep the water clean

It keeps the water clear, keeps the fishy odor to a minimum, and floats

Made the water turn foggy and my fish died within a week,DO NOT BUY.

Tank still isnt sparkling clean water.

They are SO easy to use and work really well keeping the water clean

I eventually switched to a sponge filter (I purchased here on Amazon) works much better and the water is Crystal clear.

Clears water quickly

keeps water clear

Tank still isnt sparkling clean water.

I use this in my 3.5 gallon tank and it keeps the water clear

I use these in my fish tank and they do an amazing job when it comes to keeping the water clear.

The water stays just as clear and i'm able to prolong the use of each filter.

it cleans water

Despite the small size of this filter, it has been doing a great job of maintaining clean water, when changed every two weeks

Work as they should for a nano tank

All I can say is they work as they should

n’t interfere with water flow