Why are my pre-filters turning pink?

[letmgo]

Just bought a small RO this year and have noticed the last few days my flat pre-filters are turning pink in the middle where the syrup runs through. Does this have something to do with the RO?

[buckeye gold]

To me it sounds like bacteria growing. I have on occasion seen this in buckets after a warm spell. I pull the bucket and bleach it if I see that. I would toss a filter I saw that in, prefilters are wayyyyyy cheaper than syrup!

[letmgo]

I don't think it is bacteria, as these were brand new pre-filters that were white when I used them, and were pink when I washed them out--all over the span of an hour.

[buckeye gold]

Hmmmm probably not bacteria then. Maybe someone has an answer

[psparr]

Is the felt filter turning as well? I know they can take on some color.

[letmgo]

The felt is getting a slight pink hue also.

[psparr]

Could just be the staining from the syrup. Usually more brown, but if your syrups reddish, that could be it.

[Pauly V]

Mine are doing the same. No ro. Medium Amber syrup.

[mapleleaf]

new pre filters from leader in swanton vt mine turning pink also ?????

[CampHamp]

Red leather stove gloves (Harbor Freight) will leach onto a wet filter.