Even after rinsing the filter you will still get some carbon residue in the water but will eventually diminish as you clean your fountain and rinse the filter.

I have heard fountains are so loud that the cats are frightened but this one is whisper soft and he drank from it and enjoyed the moving water

Cats love their drinking fountain.

These work perfectly with the Petsafe Drinkwell Mini Pet Fountain, which my cats LOVE by the way

I thought it could possibly be the fountain as well

We use these and cut them in half for our dog/cat water fountain - works perfect

Cats also retain enough of their wild instincts that they like running water, which they know to be safer than stagnant water, so Drinkwell fountains are ideal

Although I accidentally order the wrong filter, I used to have a water fountain compatible with this one and it worked perfectly.

Great fountain

Fit our fountain perfectly and works great.

My boy loves his fountain!

I rinse it well with cold water on both sides when I clean the fountain each week

Would recommend the water fountain to everyone

I'll just pack up the now useless water fountain and give it to Goodwill.

My cats love it and the fountain actually keeps water a bit cooler in the summer heat for them

I usually clean the fountain every 7-10 days with soap and water but only have to change the filter once a month

I love my Petsafe Fountain

love the fountain, I have 2 of them

well fountain

My doxies love their water fountain and these filters fit perfect

Great filters for a great fountain

The perfect fountain!

Fits our plastic drink well fountain that we bought back in 2012

So much cheaper on Amazon, I absolutely love the water fountain and these filters are so reasonably priced!

I cleaned the filter the best I could whenever I cleaned the fountain

Used for my cats drinking fountain and works perfectly to clean the water!

The filters Work well with the Drinkwell fountains and the brushes work great cleaning the entire fountain.

I’ve been buying/using these filters in my cats drink well fountain for years

Our dog and cats both love this fountain

I have a Drinkwell fountain for my cats, and they love it

Kitties love the fountain and the fresh water

They do last longer than recommended if you keep the water fresh and clean the fountain often.

My cat loves the water fountain.

Perfect for my kittie fountain

The cats love the fountain

Bought for the fountain, but the fountain is defective

Funny to see the cats line up to watch me clean the fountain and replace the

I use the product in the pet well fountain to keep the water clean and they work just fine.

My cat loves to drink the water and especially loves it after I clean the fountain and change the filter

have 3 fountains, works great

My cat loves the fountain

These are great for keeping my Drinkwell fountain clean for our 3 cats

Our cats love their fountain and l love how fresh the water is after changing the filter.

I love these because I love the fountain for my cat.

When I see the fountain getting a little gross after a week or two, I dump and clean it, and then I rinse the filter out with cold water and reuse it.

Love the fountain glad to have the filters on subscribe and save

Its kind of a pain to clean the fountain because you have to take it apart and clean each piece to do a good job, but the clean running water is definitely worth it.

However it's still important to clean the fountain often.

I love my Drinkwell fountain because it looks great (very Zen), is quiet and most importantly, the kitties like it.

Nice fountain, not too big.

Cats love this fountain.

My cats love the fountain.

The filters are easy to install and my cat loves her water fountain

these are the correct filters for the stainless round Petsafe fountain

Not too interested in buying another until I learn about warranty information... maybe spring for a more expensive fountain in hopes of better quality?

Not harmful, just have to clean out the fountain after a couple of days.

I do use the filters longer than recommended and when I clean the fountain I will rinse the filter out and can usually rinse out the dirty spots that appear on the white side by using my hose from kitchen sink, so I am able to prolong the useful life of these filters.

Cats loved the fountain because of the waterfall, however, I had to switch to a stainless steel fountain due to some allergies with one of the cats.

I clean my dogs’ fountain every 1-

I like the drinking fountain and these filters work.

The Drinkwell fountain is awesome!

Keep fountain very clean

Clean the fountain often, change the filter at least once a month

The definitely filter out dirt and contaminants because when I clean the fountain and change the filter I notice the white side of the filter has dirty spots on it -- these spots are the dirt and contaminants being caught.

My Kitties love their water fountain.

It will sink t the bottom of the bowl and chill there til you clean it out.

It will sink t the bottom of the bowl and chill there til you clean it out.

I normally don't give one or five star reviews unless it's as bad or good as it can possibly be

They work as they should!

Doesn't keep the water as clean as it says

Since this is the only filter that will work with my fountain, I guess it works as it should.

Buy these every few months for my small pet fountain, and they work as they are supposed to