This treatment is recommended for all fountains, indoor and out. Algae buildup can and normally does buildup in almost any fountain.
Without treatment the fountain will become slimy and the pump will eventually become clogged.
Anti-white Scale Treatment
If you are not using distilled water in your fountain it is recommended to use this treatment. This treatment will help prevent pink, white or grey markings on your fountain as a result of the chemicals in the tap water.
Depending on the size of your fountain foaming may be a problem. This is normally restricted to larger fountains but can be used on fountains of all sizes, both indoor and outdoor.
Pond Water Treatments
If your fountain is a part of a larger pond system you may want to consider a treatment intended for larger water capacities. Larger bodies of water often have stagnate areas which can lead to major problems if the water is not properly treated.
Scented Water Treatments
Intended primarily for indoor fountains, there are a variety of scents you can add to your water. While certainly not for everyone or every situation, these treatments can add a special flair to your fountain area.