We have a similar one with a larger reservoir. I haven't measured, but it can easily filter several gallons a day. If we needed more, I'd buy a second. If you

We have a similar one with a larger reservoir. I haven't measured, but it can easily filter several gallons a day. If we needed more, I'd buy a second. If you can, under-sink filters are cheaper/gal and more convenient. Make sure you're using fluoride toothpaste so your pearly whites stay pearly.