Good Product
I use Petmate Fresh Flow filters, but have to change them more often than the recommended month, because I have three cats. I'm sure they last longer for only one pet. They can also be removed, after turning off the water filter, and rinsed well then re-inserted. I do this sometimes when I don't have time to change the filter and clean the water fountain, but I clean and change it as close to once a week as possible. Again, with only one pet, this probably wouldn't be necessary.

great filters
good replacement for the original filters, and it helps the water stay fresh and increase the flow of water after it was very poor when the old filter is full of dirt

FRESH FLOW
Fresh Flow Pet Fountain by PetMate : Size DELUXE
I AM VERY HAPPY WITH MY PURCHASE MY CATS LOVE IT. I DEFINITELY THINK THEY DRINK MORE WATER THAN BEFORE.

Petmate Deluxe Fresh Flow replaceable filters
Petmate Fresh Flow Filter Replacement 3 Pack Fits Jumbo and Medium Fresh Flow
I have had my Petmate Deluxe Fresh Flow watering system for approximately a year and am extremely pleased with it. The replacement filters work very well and I would recommend them as an excellent product. I buy them in large quantities from Amazon.com and get a good price, especially with the super saver added on.

Great r\Petmate Product
I love the product and the equipment that is it used for. The price was good and the service was very fast.