This fountain worked great for about two weeks and then the filter started clogging on pretty nearly a daily basis.  It gets this brown slimey sludge stuff alll around it.  For the life of me I can't figure out what it is or where it's coming from.  I called the manufacturer and they told me to just take the pump apart and clean it out with a cotton swab, which I did.  It worked great for a couple of days and then was full of sludge again.  If anyone has an idea of what might be causing this I would love for you to post about it along with a solution.  We really do love the fountain.  One of the things I like about it the most is it stores up energy like a battery so it will still work on a cloudy day.  Again, if anyone has a solution I'd love to hear it.  Thinking about flushing it with Lime-Away or Clorox but I don't want to ruin it.