Maybe a Brita pitcher just for the kitties' water?

I'm trying to picture a filter on a pet water fountain, and can't picture it...maybe it isn't working as well as it might?

With a pitcher, it would be double-filtered at least.

I think it was Catlady that mentioned she uses filtered water all the time, as the minerals in untreated water can cause these problems.

Hope your baby is home on Monday!