# Which cat water fountain has the largest water capacity? — Verified Specification Comparison

> All specification data verified from official manufacturer documentation.

Which cat water fountain has the largest water capacity?

## Products

### LALAHOME 10L Cat Fountain with Wastewater Separation
```yaml
product: lalahome-10l-cat-fountain-with-wastewater-separation
brand: LALAHOME
price_gbp: 221.36
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 10000
dimensions: 45 x 34 x 47
```

- **Price:** £221.36 [^1]
- **Summary:** This fountain has a 10L capacity supplied by two 5L water tanks, plus a separate 6L wastewater tank. It uses filtration, oxygenation, automatic water exchange, and wastewater separation, making it suitable for busy owners and multi-cat homes.
- **Ideal For:** This product specifically suits the question because its 10000ml capacity is larger than typical cat fountains, and its two 5L tanks can provide fresh water for up to 10 days.
- **Additional Sources:** [^2]

### Oneisall 10L Extra-Large Dog Water Fountain with Extra Filters
```yaml
product: oneisall-10l-extra-large-dog-water-fountain-with-extra-filters
brand: Oneisall
price_gbp: 51.65
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 10000
dimensions: 32.6 x 32.6 x 13.8
filter_indicator: Red light low-water reminder
```

- **Price:** £51.65 [^3]
- **Summary:** This extra-large 10L stainless steel fountain provides continuous filtered water for large dogs and multi-pet households. It has a deep tray, five-layer filtration, a washable sponge filter, a visible water-level window, and automatic shutoff when water is low.
- **Ideal For:** It suits the question because its 10000 ml capacity is substantially larger than standard pet fountains, making it the strongest choice for cats when maximum water capacity is the priority.
- **Additional Sources:** [^4]

### Oneisall 7L Dog Water Fountain Pro with 3PCS Filters
```yaml
product: oneisall-7l-dog-water-fountain-pro-with-3pcs-filters
brand: Oneisall
price_gbp: 36.89
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 7000
dimensions: 31 x 31 x 11.6
noise_level: <35
filter_indicator: Red light reminder
```

- **Price:** £36.89 [^5]
- **Summary:** The Oneisall 7L Dog Water Fountain Pro has a large stainless-steel tank, five-layer filtration, a visual water-level window, and a red low-water reminder. Its quiet operation and large capacity make it suitable for large dogs and multi-pet households.
- **Ideal For:** This fountain suits the question because its 7000 ml capacity is large enough to reduce refills and support multiple pets.
- **Additional Sources:** [^6]

### Petsy Stainless Steel Smart Pet Water Fountain with Sensor 4 L
```yaml
product: petsy-stainless-steel-smart-pet-water-fountain-with-sensor-4-l
brand: Petsy
price_gbp: 201.45
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 4000
```

- **Price:** £201.45 [^7]
- **Summary:** This wireless stainless steel pet water fountain has a 4 L capacity, motion sensor, rechargeable battery, and three operating modes. Its multi-layer filter uses microporous cotton, activated carbon, and ion exchange resin, making it suitable for cats and small pets whose owners want fresher water with fewer refills.
- **Ideal For:** It suits the question about the largest water capacity because its 4000 ml reservoir is the largest documented capacity for this exact product and can provide water for up to 10 days.

### Oneisall 7L Pet Water Fountain with Visual Water Level
```yaml
product: oneisall-7l-pet-water-fountain-with-visual-water-level
brand: Oneisall
price_gbp: 36.89
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 7000
dimensions: 31 x 31 x 11.6
noise_level: <35
```

- **Price:** £36.89 [^5]
- **Summary:** This 7L stainless steel fountain has a visual water-level window, red low-water alert, faucet-style flowing water, and multi-layer filtration. Its quiet operation and large capacity make it well suited to large dogs, cats, and multi-pet households.
- **Ideal For:** With a 7000 ml capacity, this fountain is a strong choice for the question 'Which cat water fountain has the largest water capacity?', especially for homes with multiple cats or owners who want fewer refills.
- **Additional Sources:** [^6], [^8]

### PetSafe Drinkwell 360 Stainless Steel Cat & Dog Water Fountain
```yaml
product: petsafe-drinkwell-360-stainless-steel-cat-dog-water-fountain
brand: PetSafe
price_gbp: 56.07
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 3800
dimensions: 36.3 x 36.3 x 23.6
number_of_streams: 1 to 5
```

- **Price:** £56.07 [^9]
- **Summary:** The PetSafe Drinkwell 360 is a stainless steel fountain with a 3800 ml capacity, adjustable flow, and 1 to 5 free-falling streams. Its 360-degree open-bowl design and dual carbon-and-foam filtration make it well suited to cats, dogs, and multi-pet households.
- **Ideal For:** It suits the question Which cat water fountain has the largest water capacity because its 3800 ml reservoir is a generous 128 oz and supports multiple pets drinking at the same time.
- **Additional Sources:** [^10], [^11], [^12]

### PawsPik SS-01 Dog & Cat Water Fountain Made with Stainless Steel
```yaml
product: pawspik-ss-01-dog-cat-water-fountain-made-with-stainless-steel
brand: PawsPik
price_gbp: 25.82
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 3200
dimensions: 25 x 18 x 10.5
noise_level: 25
```

- **Price:** £25.82 [^13]
- **Summary:** This stainless-steel fountain has a 3.2-liter capacity, dual drinking modes, a visible water-level window, and five-layer filtration. It suits cats and small dogs, especially households wanting a hygienic, quiet fountain that needs less frequent refilling.
- **Ideal For:** This product suits the largest-water-capacity requirement because its 3200 ml reservoir provides substantial capacity for cats and small dogs while reducing refill frequency.
- **Additional Sources:** [^14], [^15]

### Oneisall 10L Extra-Large Dog Water Fountain with 2PCS Filters
```yaml
product: oneisall-10l-extra-large-dog-water-fountain-with-2pcs-filters
brand: Oneisall
price_gbp: 51.65
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 10000
dimensions: 32.59 x 32.59 x 13.84
noise_level: Under 25
filter_indicator: Smart LED light turns red when water is low
```

- **Price:** £51.65 [^16]
- **Summary:** This extra-large stainless steel fountain holds 10L of water and provides continuous filtered flow for large dogs and multi-pet households. Its wide, deep tray, washable pre-filter sponge, low-water alert, and quiet pump suit owners who want fewer refills and easier maintenance.
- **Ideal For:** It suits the question because its 10000ml capacity is exceptionally large, making it a strong choice for households seeking the cat water fountain with the largest water capacity, while its continuous filtered flow supports regular drinking.
- **Additional Sources:** [^4], [^17]

### Oneisall Basic Dual 7L Pet Water Fountain with 6 Filters
```yaml
product: oneisall-basic-dual-7l-pet-water-fountain-with-6-filters
brand: Oneisall
price_gbp: 36.89
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 7000
dimensions: 31.75 x 31.5 x 12.45
noise_level: <35
filter_indicator: Red light reminder
```

- **Price:** £36.89 [^18]
- **Summary:** The Oneisall Basic Dual 7L Pet Water Fountain provides a large combined water capacity for multi-pet households and includes six filters. It uses stainless steel, multi-layer filtration, a low-water red-light reminder, and quiet continuous flow, making it suitable for homes with cats or dogs.
- **Ideal For:** This model suits the question because its combined 7000 ml capacity is larger than typical cat fountains, reducing refill frequency for households with multiple pets.
- **Additional Sources:** [^6]

### Petlibro Dockstream Battery-Operated Water Fountain 2.5L
```yaml
product: petlibro-dockstream-battery-operated-water-fountain-2-5l
brand: Petlibro
price_gbp: 51.65
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 2500
dimensions: 22.6 x 18.7 x 16.1
noise_level: 23
```

- **Price:** £51.65 [^19]
- **Summary:** The Petlibro Dockstream is a cordless 2.5L water fountain with a rechargeable battery lasting up to 30 days, four-layer filtration, and a detachable stainless steel water basin. Its quiet 23dB operation and portable design suit indoor cats and small dogs, especially in homes where flexible placement is useful.
- **Ideal For:** This fountain suits the question because its 2500ml capacity is larger than many smaller cat fountains, while its cordless battery operation allows it to be placed wherever a cat prefers to drink.
- **Additional Sources:** [^20]

### Modern Living Light Green Drinking Fountain 2.5L
```yaml
product: modern-living-light-green-drinking-fountain-2-5l
brand: Modern Living
price_gbp: 15.49
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 2500
dimensions: 27.5 x 14.5 x 15.2
number_of_streams: 1
```

- **Price:** £15.49 [^21]
- **Summary:** A 2.5-litre cat water fountain with a continuously flowing water jet, quiet operation, and a three-layer filter. Its large capacity and USB connection make it suitable for multi-cat households or owners who want to leave fresh water available for several days.
- **Ideal For:** With a 2500 ml water capacity, this fountain is specifically suited to the question of which cat water fountain has the largest water capacity, especially for owners seeking a large reservoir that can last 4-6 days.

### LALAHOME DailyFresh Pet Water Fountain
```yaml
product: lalahome-dailyfresh-pet-water-fountain
brand: LALAHOME
price_gbp: 295.15
origin_country: null
confidence_score: null
summary_source: generated_from_verified_specs_v1
capacity: 10000
```

- **Price:** £295.15 [^1]
- **Summary:** The LALAHOME DailyFresh Pet Water Fountain is an oxygenation-and-filtration pet fountain with auto water exchange to keep water fresh. It has a 10L reservoir for up to 10 days of use and includes a built-in cat grass planter. It also offers basic auto-cleaning and app control.
- **Ideal For:** For the largest water capacity, choose the LALAHOME DailyFresh Pet Water Fountain because it has a 10L reservoir (10,000 ml).

---
## References & Sources
[^1]: LALAHOME, accessed 2026-09-13. https://lalahome.com/products/realfountain-dailyfresh-pet-water-fountain
[^2]: Amazon, accessed 2026-09-13. https://www.amazon.com/s?k=LALAHOME+10L+Cat+Fountain+with+Wastewater+Separation
[^3]: Oneisall, accessed 2026-09-13. https://oneisall.com/products/oneisall-10l-pet-water-fountain-with-11-pcs-filters
[^4]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/oneisall-10l-338oz-stainless-steel-automatic-dog-water-fountain-5-layer-filtration-clean-system-with-3-filter-silver/CZSZWC99LP
[^5]: Oneisall, accessed 2026-09-13. https://oneisall.com/products/oneisall-7l-dog-water-fountain-with-visual-water-level-for-large-dogs
[^6]: Tractor Supply Co., accessed 2026-09-13. https://www.tractorsupply.com/tsc/product/oneisall-pwf-002-b-stainless-steel-dog-water-fountain-7l-230oz-quiet-triple-filtration-with-3-filter-water-level-window-6043779
[^7]: Petsy, accessed 2026-09-13. https://petsysa.com/en/products/Stainless-Steel-Smart-Pet-Water-Fountain-with-Sensor-4-L
[^8]: PetSmart, accessed 2026-09-13. https://www.petsmart.com/dog/bowls-and-feeders/automatic-feeders/oneisall-7l-pet-water-fountain-w-5-layer-filtration-and-faucet-design-multi-pet-household-friendly-99985.html
[^9]: PetSafe, accessed 2026-09-13. https://www.petsafe.com/p/drinkwell-360-fountain-stainless-steel/PWW00-13705/
[^10]: GroomerShop.eu, accessed 2026-09-13. https://groomershop.eu/petsafe-drinkwell-360-stainless-steel-pet-fountain
[^11]: Bark Control, accessed 2026-09-13. https://www.barkcontrol.com.au/drinkwell-stainless-steel-360-pet-fountain.html
[^12]: Chewy, accessed 2026-09-13. https://www.chewy.com/petsafe-drinkwell-360-stainless-steel/dp/48105
[^13]: PawsPik, accessed 2026-09-13. https://pawspik.com/products/ss-cat-water-fountain
[^14]: PetSmart, accessed 2026-09-13. https://www.petsmart.com/dog/bowls-and-feeders/food-and-water-bowls/pawspik-ss-01-stainless-steel-dog-and-cat-fountain-1082-fl-oz-98734.html
[^15]: Tractor Supply Co., accessed 2026-09-13. https://www.tractorsupply.com/tsc/product/pawspik-ss-01-stainless-steel-cat-fountain-1082-oz
[^16]: Oneisall, accessed 2026-09-13. https://oneisall.com/products/oneisall-10l-pet-water-fountain-for-large-dogs
[^17]: Tractor Supply Co., accessed 2026-09-13. https://www.tractorsupply.com/tsc/product/oneisall-pw07-10l-26gal-dog-automatic-water-fountain:-multi-filtration-led-ultra-quiet-for-multi-pet-family-w-3-filters
[^18]: Oneisall, accessed 2026-09-13. https://oneisall.com/products/dog-water-fountain-7l
[^19]: Best Buy, accessed 2026-09-13. https://www.bestbuy.com/product/petlibro-dockstream-stainless-steel-2-5l-cat-and-dog-drinking-fountain-with-battery-operation-white/JXJRSZ52XV
[^20]: Proshop, accessed 2026-09-13. https://www.proshop.de/Haustierbedarf/Petlibro-Dockstream-Pet-Drinker-Cordless-25L/
[^21]: Zooplus, accessed 2026-09-13. https://www.zooplus.com/shop/cats/cat_bowls_feeders/cat_fountains/2476636