Bests & Worsts Reviews from Amazon

These filters are defective in my opinion. There may be a toxin in them and they need to be analyzed in a lab. My cat got a rare case of hemolytic anemai where the immune system destroys the cat's red blood cells. My research points to a toxin as the cause. My other cat is okay but maybe she has a stronger immune system. I quit using these filters because they cause the water to foam 2 days after cleaning the fountain thoroughly and slime to build up on the pump in a week. Is it a bacteria, or something in the filters? I can't afford to get these analyzed since I just had to pay my vet $600 for end of life care. I'm so heartbroken. I know it wasn't caused by me not cleaning the fountain properly because I've been using fountains for 12 years with no problems. With other filters. Never had a problem until this year when I started using these filters.