Sometimes water around the fountain is caused by pets drinking. Some pets are prone to spilling. Watch your pet when he drinks to see if this is the cause. If it is, you can purchase a fountain mat or other water-resistant mat to place under the fountain.
Try to find the leak. Look for visible cracks in the bowl.
If there are no visible cracks in the bowl, place the fountain on a towel to see where the leak is.
If you find a leak, you can attempt to patch it or call Customer Care about replacing the fountain.
If the cord is wet above the water line, loosen the cord and allow some slack so water won't travel up the cord.
If you have the Original fountain, you may need to remove the pump to properly clean around it.
If you have multiple pets or dogs use the fountain, the slimy feeling may be caused by your pet's saliva. Change the water and clean your fountain more frequently to prevent this.
Make sure the fountain parts are rinsed thoroughly after cleaning the fountain. Soap residue may cause the sliminess.
To reduce mold and mildew, soak the fountain in a 90% water, 10% bleach solution for 15 minutes. Be sure to rinse every part thoroughly before re-assembling the fountain.
If there is a white chalky substance in the fountain, your fountain may have a mineral deposit build-up from hard water. To remove these deposits, clean the fountain parts with a 90% water, 10% vinegar solution. Rinse all parts thoroughly afterwards. Use filtered or purified water instead of hard tap water to prevent this.
This black stuff is loose charcoal from the filter and is completely harmless for your pet to drink. The charcoal filter is made of organic coconut shells. Rinse the filter in cold water before placing it in the fountain to prevent this. Some filters may shed more charcoal than others due to differing consistency of charcoal in each batch of filters, so don't be surprised if some filters leave behind more charcoal dust than others.