Replacement Premium Water Filter for NPET WF050 Transparent Water Fountain, Arc-Shaped, Washable Pet Fountain Filters with Triple Filtration System, 12 Pack

There are other versions but this is the best replacement filter.

These filters are questionable and differ from the ones supplied with my cat fountain. The original filters were two separate pieces made from different types of foam to purify the water in the fountain. These new filters however are one piece of two different colors and both parts look exactly the same. I've found small black pieces floating in the water that appear to be micro pieces of foam. Since changing to these new filters my cats don't drink from the fountain as much as they use too. I believe the foreign pieces in the water to be the culprit. Never had this problem with the original filters.

Good

To get the obvious part out of the way for context: yes, these filters are just two sponges glued together. It's best used to catch chunks of debris such as food remnants in the water fountain. It is not a charcoal filter.I've purchased two packs of this product about a year apart. The most recent was in February 2023, the previous was in April 2022. I did not have any issues with the original pack I bought in April 2022.However, the most recent pack that I bought as a refill either uses a different kind of adhesive, or the adhesive is incorrectly applied. The glue will blend with the water after a short period of time, less than an hour, regardless of how well it is washed beforehand.Not only does the water have a very obvious glue smell to it afterwards, but it has a distinctly bitter taste to it as well (yes, I tasted the water). Fortunately, I have cats that are fickle enough to not drink contaminated water and let me know very quickly something was wrong by sitting in front of the water fountain and whining.I used two filters out of the pack I received, and both resulted in this bitter glue aftertaste to the water. To make sure it wasn't the fountain itself, I used a different brand of filters as a control which did not cause the glue smell or taste.I would VERY STRONGLY DISCOURAGE anyone from purchasing these. The product probably needs a recall, but given the manufacturer is apparently located somewhere overseas, that is unlikely to happen.

Great value and they fit the cat’s water fountain. The filter did its job, but the entire fountain is not recommended for multi-cats.

Do just as advertised.

I have my WF050 from December 2022. These new filters fit perfectly in the space designed; just clean all the pieces of the fountain, activate the filter, and then put them in the basket, and that's it—another year with good water for my cat.

These work, but they lack the charcoal filter that many have. You can easily pull them out and clean them. I have even wet them and put in microwave for 30 seconds to eliminate and bacteria or mold.