![Used MetalXtract Filters](https://www.aquarv.com/dev/wp-content/uploads/2019/04/metalxfilters.jpg)
I used my Aqua RV FillFast system and my filters turned out covered when I pulled them out. My staining stopped while I was using the filters. So, what causes the filters to be so gunked-up?
Answer: The MetalXtract filters can collect metals out of the water and also other things like tannins. So, this is why your surfaces are staying so stain-free.