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Why does the surface of a fountain filter change its color?

Sometimes when you change the fountain filter, you will be so surprised to find the surface of the filter turns yellow or blue or even red.


You may wonder if the filter is made of poor-quality materials, or if the filter has indeed filtered something.

Will this hurt your fur babies? Or Is it normal to find the color of the filter changes?

And now we are about to explain this for you as follows.


Why does the fountain filter turn yellow?

If the water in the fountain is groundwater, or if you live in mountainous areas and use mountain water, the chances are that the fountain filter will turn yellow. This is because traces of soil or sand still remain in the water, and when the filtration process of the fountain works, they will be filtered and adheres to the surface of the fountain filter.


Why does the fountain filter turn blue?

In most circumstances, the water purifier filter becomes blue because the water supply pipe has been in lack of maintenance, which makes it a perfect environment for bacteria and microalgae. Or water tank or container for a building is not in routine cleaned up, making it damp and wet and growing moss and other microorganisms. The microbial thing in the tap water will be separated and filtered by the water purifier filter, rendering the surface of the filter blue.


Why does the fountain filter turn red?

One possibility is that this is caused by the rusty water supply pipe. The water in this kind of rusty water pipe will have a chemical reaction with Ferrum (Fe) and the rust (namely Fe2O3) is generated. The water therefore will slightly turn red but this can be hardly observed. When such tap water passes through the fountain filter, the traces of rust will be trapped, leaving the surface of the filter red. In fact, this is the rust that is filtered out.

Another possibility is that the fountain is placed where is damp and humid. Due to its abundant presence in the environment, and its preference for damp conditions, some bacteria like Serratia marcescens can be commonly found growing in bathrooms (especially on tile grout, shower corners, toilet water line, and basin), where it manifests as a pink, pink-orange, or orange discoloration and slimy film feeding off phosphorus-containing materials or fatty substances such as soap and shampoo residue. All in all, it requires a nutrient-rich medium to grow on. When the fountain filtration works, it will also trap this kind of bacteria. Therefore, please do make cleaning of the fountain routinely, every 2 weeks at best.


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