Purifying Liquid Refill: How Often to Change Fountain Water
By PETKIT | Auto Litter Box, Smart Feeder, Water Fountain | Published: 2026-10-14
Category: Handleidingen
Learn how often to change your cat's fountain water and how to use PETKIT Purifying Liquid Refill as part of a simple cleaning routine for fresher water and a healthier cat.
Quick answer
Change your cat's fountain water every 2–3 days, and do a full clean with fresh water weekly. If you use a pet water fountain purifying liquid, add it only after each full water change—never top off old water with new liquid. This keeps the water fresh and your cat drinking.
Why water changes matter more than you think
Cats are finicky about water. A fountain that looks full can still taste stale after a few days because saliva, food particles, and dust accumulate. That's why a fountain water refill routine is not just about refilling—it's about replacing. When you dump the old water and rinse the basin, you remove the film that bacteria love. If you only top off, you're diluting the problem, not solving it.
Match the routine to your fountain and your cat
Not all fountains are the same. A small 1.5-liter fountain in a multi-cat home may need a full change every other day, while a larger 3-liter fountain for one cat can stretch to three days. Watch your cat: if they start pawing at the water or drinking from the sink, that's a sign the fountain needs attention sooner. Also check the filter—if it looks brown or the flow slows, replace it before adding new water.
How purifying liquid fits into the schedule
Purifying liquid is a helper, not a substitute for changing water. Add the recommended dose after you've filled the fountain with fresh water. It helps control odor and germs between changes, but it won't keep water fresh indefinitely. Think of it as extending freshness by a day or two, not as a reason to skip the weekly deep clean.
Your step-by-step fountain water routine
- Empty the fountain completely: Unplug the fountain and pour out all old water. Don't just top it off—old water contains dissolved organics that make fresh water go stale faster. Checkpoint: If the water smells off or looks cloudy, you waited too long. Adjust your schedule.
- Rinse the basin and parts: Rinse the bowl, pump housing, and any removable parts with warm water. Use a soft brush for corners. Avoid soap unless you rinse thoroughly—soap residue can deter cats from drinking. Common mistake: Skipping the pump. A slimy pump impeller reduces flow and harbors biofilm.
- Refill with fresh, cool water: Fill to the max line with fresh tap or filtered water. If your cat prefers running water, make sure the fountain is assembled correctly before plugging it back in. Checkpoint: Listen for the pump. If it's noisy, it may need cleaning or more water.
- Add purifying liquid if you use it: Measure the recommended amount of pet water fountain purifying liquid and add it to the fresh water. Never add it to old water—it won't revive stale water and may waste product. Common mistake: Doubling the dose. More is not better; follow the bottle instructions.
- Log the change and set a reminder: Note the date on your calendar or phone. A simple 2–3 day reminder for water changes and a weekly reminder for deep cleaning keeps you consistent. Next step: If you have multiple cats, shorten the interval by a day.
Product facts
- Purifying Liquid Refill（4 Bottles）: Purifying Liquid Refill (4 bottles) provides safe, non-toxic odor and germ control for PETKIT litter boxes equipped with air purifier modules. Compatible with Pura X, PuraMax, and PuraMax 2. If you already use PETKIT purifying liquid for your litter box, you can use the same refill bottles for your fountain routine—one less product to keep track of. Just remember it's designed for litter box air purifier modules, not as a fountain additive unless specified. Always check compatibility with your fountain model.
