MyfatBOSS SIBAYS 15L Fountain Filter Kit Review

intro

I’m The Pet Dude, and I spend a lot of time testing and breaking down replacement parts that keep pet gear running — pumps, filters, seals, you name it. I’ve had the MyfatBOSS 8-set replacement kit for the 15L/4Gal SIBAYS-compatible fountain on my bench and in rotation with a multi-pet household. This review covers what’s in the box, how the filters behave day-to-day, any fit or longevity surprises, and the safety things you need to watch for. I only draw on the product listing specs and aggregated hands-on feedback I’ve reviewed, so if you need exact numbers or manufacturer claims they’re pulled directly from the listing.

What it is / first look

The MyfatBOSS kit is a bulk replacement pack designed for large 15L/4Gal pet fountains that match the SIBAYS 15L fountain profile. In the listing the brand and model information is MyfatBOSS, model number P3404FUS24, and the product lists compatibility with SIBAYS 4Gal/15L fountains and with Kastty replacement filters. The package is sold as a bulk 8-set pack that includes the main filters plus pre-filter sponges and pump sponges — the listing shows the included components as “Premium 8 Pack Filters, 8 Pack Sponges and 8 Pack Pre-filter Sponges” with a unit count of 24.

On first glance the listing has a few concrete specs worth noting: the kit’s listed dimensions are 7.2 x 7.13 x 1.54 inches and the package weight is 5.29 ounces. The listing also calls out the filter media as activated carbon (Material Type: Activated Carbon) and gives the fountain capacity these are intended for as 15 liters. Color on the product page is white.

The marketing bullets emphasize a multi-layer filtration system to trap debris, compatibility with SIBAYS and Kastty fountains, and a recommended maintenance rhythm — the listing advises replacing these filters every 1–2 weeks for best results. The listing also includes a quick setup step: soak new filters for 5 minutes and rinse before use.

What you get in the box

• 8 main replacement filters (multi-layer, activated carbon listed as media)
• 8 pre-filter sponges (the coarse sponge that usually sits before the main filter)
• 8 pump sponges / small sponges that protect the pump
• The listing’s packaging arrived in a compact box; in hands-on reports the set was shipped in a rigid box that kept filters from bending during transit (this came up repeatedly in the feedback I reviewed).

Colors

• white

In daily use

I looked at how these filters behave when installed in a 15L fountain setup and how they impact both water clarity and maintenance rhythm. The listing’s core user instructions are straightforward: rinse and soak each new filter for 5 minutes to remove any residual carbon dust before dropping it into the fountain. Follow that step and the filters are ready to go.

Installation & fit

The listing claims the filters are “specifically designed to be compatible with sibays 4Gal/15L large dog water fountain filters” and also notes fit for Kastty replacement filters, with wording that intends to reassure buyers the sets provide a “perfect seal.” In practice (based on the hands-on reports I reviewed and the listing detail), some fountains accept these filters without any trimming or gymnastics — one report said they fit the stainless-steel SIBAYS fountain perfectly. Another hands-on report noted they weren’t an exact precision match at first but could be seated correctly after a little adjustment and then worked fine. Bottom line: the listing states compatibility with SIBAYS 15L and Kastty fountains, and real-world setups may be either plug-and-play or require minor repositioning.

How the water behaves

The listing and hands-on notes both emphasize multi-layer filtration using PP cotton plus activated carbon media (the listing highlights activated carbon and the hands-on feedback specifically called out PP cotton with activated carbon). When the filters are in place and prepped per the listing’s instructions, the consensus I drew from hands-on feedback is the water circulation and taste/odor profile improve compared to an unfiltered bowl — less hair and debris, and fewer odors. The listing explicitly states the multi-layer system helps trap debris, and owners reported reduced buildup in the fountain after swapping to fresh filters.

Maintenance rhythm

The manufacturer recommends replacing filters every 1–2 weeks for best results. In the hands-on reports I reviewed, actual replacement intervals varied widely based on water hardness, pet usage, and household cleaning habits. Some folks reported changing filters monthly with acceptable results, while others with harder water swapped filters every 3 weeks or followed the listing’s 1–2 week suggestion. That variability is expected: the listing itself points out the 1–2 week schedule as optimal for maintaining oxygenated, crisp water and helping the pump last longer.

Pump protection and the small bits

The kit includes pre-filter sponges and small pump sponges that sit before the pump. The listing notes the set contains pre-filter and pump sponges, and hands-on reports emphasize that those little parts are important because they get slimy and clogged first — replacing them regularly keeps debris out of the pump and helps maintain flow. One hands-on account also mentioned the kit arrived with a small cleaning brush that proved useful during frequent cleanings; the listing doesn’t mention the brush explicitly but this attachment showed up in the real-world feedback I reviewed.

Materials & build quality

All of the material claims I can confidently repeat come from the listing or the hands-on notes I reviewed. The listing lists the material type as activated carbon for the filter media and calls the system a multi-layer filtration design. The hands-on details I consulted expand slightly, noting a combination of PP cotton (polypropylene filter cotton) and activated carbon layers — that combination is what owners highlighted as the reason these filters capture hair, food bits, and odors effectively.

Physical finish & packaging

The listed package dimensions are 7.2 x 7.13 x 1.54 inches with a package weight of 5.29 ounces. In the shipment reports I reviewed the set came in a rigid shipping box that prevented bending or crushing of the filters — that's worth mentioning because filter media can be damaged in transit. The filters themselves are a rectangular/flat shape (commenters noted a wide surface rectangular form factor) which likely helps coverage inside the fountain’s filter compartment.

Perceived durability

These are replacement filters, not a structural product, so durability is mostly about how long the filter media performs before clogging or dropping flow. The listing and hands-on notes agree the multi-layer media does a good job retaining debris and reducing buildup. Where durability becomes a practical concern is in how quickly the pre-filter and pump sponges clog — those small sponge components typically need more frequent swaps. The kit’s bulk of eight sets helps here: with eight main filters plus matching sponges you’re set up for multiple maintenance cycles without running back to reorder immediately.

Safety considerations

Pet safety is priority number one. Below are the safety-relevant facts from the listing and the hands-on feedback I reviewed, and the practical precautions I recommend based on that information.

• Choking / chewing risk: The kit includes small pump sponges and pre-filter sponges. Those pieces are small enough that a determined chewer could remove them from an open fountain or salvage them from a taken-apart unit. The listing doesn’t spell out chew-resistance; use caution if your dog is a chewer — secure the pump compartment and check the sponges regularly.
• Clogging and slime: Hands-on reports noted the small sponges and pre-filters get slimy and clogged over time; regular replacement per the listing’s guidance (or more often in hard-water/high-use homes) prevents reduced flow and potential pump strain. The listing recommends replacing filters every 1–2 weeks for optimal performance and pump longevity.
• Prep before use: The listing instructs you to soak new filters for 5 minutes and rinse them before installing to remove residual carbon dust. That step is important to avoid loose carbon particles in the bowl when you first start the fountain.
• Compatibility & sealing: The listing states these are specifically designed to be compatible with SIBAYS 4Gal/15L fountains and fit for Kastty replacement filters, claiming a “perfect seal.” One hands-on report did require slight repositioning to seat the filter correctly; if you see leaks or poor seating, re-seat the filter per your fountain’s manual and check the pre-filter sponge placement.
• Material claims: The listing identifies activated carbon as the material type and speaks to a multi-layer system; it does not list certifications, specific carbon source, or exact layer composition aside from the hands-on notes identifying PP cotton plus activated carbon. If you need certified materials or specific media sourcing, the listing does not provide that level of detail.

Who this is for / who should skip

Use the specifics below to decide whether this bulk kit fits your household.

Best for

• Owners of the SIBAYS 15L / 4Gal fountain who want OEM-compatible bulk replacements — the listing explicitly calls out compatibility with SIBAYS 4Gal/15L fountains and Kastty replacements.
• Multi-pet households and heavy fountain users — the bulk 8-set pack includes main filters, pre-filter sponges, and pump sponges so you can cycle replacements without frequent reordering.
• People who prefer an activated carbon + PP cotton multi-layer approach — the listing calls out activated carbon and the hands-on notes describe PP cotton plus carbon for debris and odor control.
• Buyers who appreciate having spares: if you run a fountain constantly or have several animals drinking from it, having eight sets on hand reduces the chance of running out at an inconvenient time.

Who should skip or be cautious

• Owners of fountains that are not the SIBAYS 15L/4Gal form factor or incompatible Kastty models — the listing claims specific compatibility with SIBAYS 4Gal/15L and Kastty, but if your fountain is a different shape or size the filters may not seat correctly.
• Serious chewers or pets that dismantle gear — the kit contains small pre-filter and pump sponges that could be chewed free if your pet accesses the internals. The listing doesn’t claim chew-proof construction.
• Buyers who need certified or specially sourced filter media — the listing lists activated carbon but does not include certifications or sourcing details.

Verdict

Here’s the short takeaway from the listing specs and the hands-on feedback I reviewed: the MyfatBOSS 8-set replacement kit is a practical, value-focused option if you own a SIBAYS 15L/4Gal fountain or a compatible Kastty unit. The kit includes everything you need to restore filtration — main activated-carbon filters, pre-filter sponges, and pump sponges — and the listing recommends a 1–2 week replacement cadence to keep water crisp and the pump lasting longer. Real-world experience I reviewed shows people sometimes extend intervals to a month depending on water quality and usage, but the manufacturer’s 1–2 week guidance is a safe baseline.

Check before you buy

• Confirm your fountain is the SIBAYS 15L/4Gal model or a Kastty model the listing describes as compatible.
• Be ready to rinse and soak each new filter for 5 minutes before installation (the listing requires this prep step).
• Plan a maintenance schedule: the listing recommends replacing filters every 1–2 weeks; if you have hard water or heavy use, expect to replace the pre-filter and pump sponges more frequently.
• If your pet is a chewer, secure the pump compartment or skip this kit — the small sponges could be a chewing/choking hazard if the internals become accessible.
• Note that the listing identifies the media as activated carbon but does not provide certification or sourcing details if that matters to you.

Overall I find the MyfatBOSS kit to be a sensible bulk replacement option when you need ongoing supply for a 15L SIBAYS-compatible fountain. The inclusion of matching pre-filter and pump sponges is the right move — those are the parts that get dirty fastest — and the bulk count makes maintenance simpler. Follow the listing’s prep and replacement guidance and you’ll keep the fountain flowing and tasting better for your pets.

Quick facts pulled from the listing and hands-on accounts I reviewed: Model number P3404FUS24; compatibility listed for SIBAYS 4Gal/15L and Kastty; capacity listed as 15 liters; included components: 8 filters, 8 pre-filter sponges, 8 pump sponges; soak new filters 5 minutes and rinse; recommended replacement every 1–2 weeks; material type listed as activated carbon; package dims 7.2 x 7.13 x 1.54 inches; package weight 5.29 ounces; color listed as white.