does it really have ion exchange resin to soften the water? or is it just charcoal?

It has a ultra violet light and charcoal filter.

what is the purpose of the sponge?

There are two filters one goes around the motor and one the white one is where the water goes back down into the bowl after the pup or kitty has been drinking and catches the dirt from the top of the bowl or anything else that lands in the water from the air around it.. I rinse it off regularly so I don’t have to change it as often it can get slimy I also use spring water because my tap water isn’t the best and can cause stones in my dog he’s fighting them now in his bladder and kidneys the crystals aren’t flushing through and he’s loaded again which is the reason for the water bowl it actually has him drinking more water

Are the pads made from polyester like some of the other brands?

Yes, they are charcoal filled polyester pods.

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Petilog Cat Water Fountain Filters for 108/3.2L& 67oz/2L Stainless Steel Pet Water Dispenser Fountain Filter Replacement with 8 Sponges (8 Filters&8 Sponges)

Product ID: 475795903

Details

External testing certification
1
Item weight
2.08 Ounces
Material
Cutton
Product benefits
Removes Pet
Product dimensions
12.7D x 12.7W

🧴BPA-free safe materials

♻️8 filters + 8 sponges pack

🛡️4-layer filtration system

$15.66

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Description

💧 Keep your cat’s water fresher, longer — because they deserve the best sip in town!

TRUSTED BY THOUSANDS - Top-rated with 4.6 stars and thousands of happy customers—join the community of pet care pros.
EFFORTLESS MAINTENANCE - Quick rinse and replace every 2-4 weeks ensures your cat always drinks pure, clean water.
HEALTH FIRST MATERIALS - Crafted from BPA-free, pet-safe materials to protect your furry friend’s wellbeing.
CRYSTAL CLEAR HYDRATION - Advanced 4-layer filtration removes pet hair, food residue, and odors for fresher water every sip.
BULK SUPPLY BULK SAVINGS - Includes 8 filters and 8 sponges—enough to keep your cat’s fountain fresh for months without hassle.

Petilog Cat Water Fountain Filters offer a premium 4-layer filtration system combining activated carbon and non-woven fabric to effectively remove pet hair, food debris, and odors. This BPA-free, safe replacement pack includes 8 filters and 8 sponges designed for 108/3.2L & 67oz/2L stainless steel pet fountains, ensuring fresh, hygienic water with easy bi-weekly to monthly maintenance. Highly rated and trusted by thousands, these filters elevate your pet’s hydration experience.

Specifications

ASIN	B09V2WL1WB
Best Sellers Rank	#1,718 in Pet Supplies ( See Top 100 in Pet Supplies ) #30 in Cat Fountains
Brand Name	Petilog
Customer Reviews	4.6 4.6 out of 5 stars (2,623)
External Testing Certification	1
Included Components	Pet fountain filter replacement
Item Dimensions D x W x H	12.7D x 12.7W x 12.7H centimeters
Item Type Name	Pet fountain filter replacement
Item Weight	2.08 Ounces
Manufacturer	Petilog
Manufacturer Part Number	1
Material Type	Cutton
Model Number	1
Number of Items	8
Product Benefits	Removes Pet Hair
Set Name	8 Filters & 8 Sponges
Unit Count	1 Count

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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Fantastic experience overall. Will recommend to friends and family.

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$15.66

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

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TrustScore 4.5 | 7,300+ reviews

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Customer service was outstanding when I had questions about the product.

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