PETKIT Filter Unit 3.0 and Fountain Care: Buying Guide
By PETKIT UK | Published: 2026-10-13
Category: Buying Guides
Learn which PETKIT fountains the Filter Unit 3.0 fits, how often to change a pet fountain filter, and when a bundle beats buying parts separately.
Quick answer
If you already own a PETKIT fountain, buy the Filter Unit 3.0 5-pack and replace the filter roughly every two to four weeks, or sooner if the water looks cloudy or your pet drinks less. If you are starting from scratch, a bundle such as YumShare Solo+EverSweet Fountain or YumShare Dual Hopper+EverSweet Fountain gets you feeding and hydration in one purchase, and the same Filter Unit 3.0 keeps that fountain fresh.
Which PETKIT fountains actually take Filter Unit 3.0
Fit is the first thing to check, because a filter that does not seat properly lets debris bypass the media. The Filter Unit 3.0 is made for the EVERSWEET2, EVERSWEET2S, EVERSWEET3, EVERSWEET3 PRO and EVERSWEET SOLO. If your fountain is not on that list, do not force the cartridge in; check the model name on the base of the unit before ordering.
The EVERSWEET SOLO SE is a separate case. It is a plug-in drink solution that runs without an app, so it is a simple choice for a household that wants one less thing to set up. Its filter requirements are not listed in the same way as the Filter Unit 3.0 range, so confirm the correct part for that model rather than assuming the 3.0 cartridge fits.
How often to change a pet fountain filter
A filter is a consumable, not a permanent part. Two to four weeks is a sensible working rhythm for one or two pets; multi-pet homes, long-haired cats and dogs that drool into the bowl tend to sit at the shorter end. Rather than counting days, use the water as your signal: cloudiness, a slimy feel on the tray, or a pet sniffing and walking away all point to a change.
Two habits make each replacement last its full interval. First, soak the new filter for at least 10 minutes in clean water before installing it, as the manufacturer instructs, so the cartridge is fully wetted and loose carbon dust is rinsed away. Second, reset the device after the replacement so the reminder timer starts from zero instead of counting from the old filter.
Filter, fountain or bundle: what to buy first
Buy the 5-pack when the fountain is working and only the cartridge is due. It is the lowest-cost way to stay on schedule, and keeping a spare on the shelf removes the temptation to stretch a filter past its useful life while waiting for a delivery.
Buy a bundle when you are adding a fountain or replacing a feeder at the same time. Pairing a YumShare feeder with an EverSweet fountain means one order covers meals and water, and the fountain in both bundles is served by the same Filter Unit 3.0 routine you are already learning here. If you are unsure which feeder suits your household, the deciding factor is usually how many different foods you serve, not how many pets you have.
Where to keep spares and what to skip
Store cartridges sealed and dry, away from strong-smelling cleaning products, and note the install date on the calendar or in the app. A 5-pack covers roughly two to five months on a two-to-four-week rhythm, which is a reasonable stock level without tying up cupboard space.
Skip generic cartridges that are not shaped for your model, and skip the urge to rinse and reuse a filter beyond its interval; the media is doing the work, and once it is saturated, rinsing only makes the water look cleaner than it is. If you are unsure whether the fountain itself is the problem, clean the pump and tray first, then judge whether a new filter changes anything.
Decision rules for PETKIT fountain care
- Fountain already on the Filter Unit 3.0 list: Order the 5-pack and set a two-to-four-week replacement reminder, shortening the interval for multi-pet or long-haired households. Keep one spare cartridge on the shelf so you never stretch a filter while waiting on delivery.
- Fountain is an EVERSWEET SOLO SE: Confirm the correct filter for that model before buying, because the 3.0 fitment list names the EVERSWEET2, 2S, 3, 3 PRO and SOLO only. When in doubt, check the model name on the base of the fountain.
- Starting fresh with no fountain or feeder: Compare the Solo and Dual Hopper bundles on how many foods you serve, not on pet count; both include an EverSweet fountain. One hopper is enough unless you actually split two foods.
- Water still looks off after a fresh filter: Clean the pump and tray before buying more cartridges, since a dirty pump can undo a brand-new filter. Fix the hardware first, then judge the filter.
Product facts
- Filter Unit 3.0 -5pcs: Filter Unit 3.0 comes as a 5-piece pack for the EVERSWEET2, EVERSWEET2S, EVERSWEET3, EVERSWEET3 PRO and EVERSWEET SOLO, with double filter components, a high density micropore filter, and a silica gel sealed ring with a lock key design. The sealed ring and lock key are what keep water passing through the media instead of around it, so a correctly seated cartridge does more for water quality than a cheaper loose-fitting one.
- YumShare Solo+EverSweet Fountain: YumShare Solo+EverSweet Fountain bundles a YumShare Solo with Camera and an Eversweet wireless pump water fountain, with a 1080P camera and 140° wide viewing angle on the feeder. This is the entry point for a household that wants one camera feeder plus a fountain, and the fountain side follows the same Filter Unit 3.0 replacement routine.
- YumShare Dual Hopper+EverSweet Fountain: YumShare Dual Hopper+EverSweet Fountain pairs a dual-hopper feeder with a camera with an EverSweet fountain, and the dual-hopper system stores two different types of food. Choose this over the Solo bundle only if you genuinely serve two different foods, since the second hopper is the feature you are paying for.
Who this setup suits
Best for
- Owners of an EVERSWEET2, EVERSWEET2S, EVERSWEET3, EVERSWEET3 PRO or EVERSWEET SOLO fountain who want a straightforward replacement schedule
- Households adding a camera feeder and fountain together and preferring one order for both
Not for
- Owners of a fountain model that is not on the Filter Unit 3.0 fitment list, who should source the correct cartridge instead
- Anyone expecting a filter change to fix a noisy or clogged pump, which needs cleaning rather than a new cartridge
