This is where the care for the indoor waterfall pump comes in; the pump motor requires a much more thorough upkeep. Evaporation and humidity are two elements that can interfere with the proper functioning of the pump when not properly watched. A fair quantity of water can be lost due to evaporation. These two factors severely deplete the water supply that is supposed to surround the pump. This can severely damage the water pump.

There are certain basic aspects that ought to be kept in mind before plunging into the field of looking after your indoor waterfall-

• Get rid of those floating creeps! Unless you are a tadpole, "algae" is never a good answer to the question, "Guess who's coming to dinner?" To avoid unwanted sights and smells when your guests visit you for parties, or when your relatives come over to your place for a family get-together, treat the water of your indoor waterfall with a few drops of bleach, or anti-algae or anti-white scale water treatment. Do this no more than once a week, and be careful with the quantity; use just one drop per gallon of water, otherwise it will cause the algae to mutate. Bleach often contains chlorine, so too much of it would make your fountain smell like a public swimming pool. Bleach can also have an adverse effect (natch) on your indoor waterfall’s finish, so using a water clarifier turns out to be a better choice.
• Be spick and span at all times. Indoor, floors, tabletops, and wall fountains should be given a full cleaning every four to six months. The outdoor variety of waterfalls requires more frequent cleaning. To clean your indoor waterfall, remove the water from the fountain and wipe it clean with a soft cloth and material suitable cleaner. Find the water pump, detach it from the unit (be careful not to end its life!) and clean it, too. It ain’t too much of a biggie: it's like Lego for grownups. However, if putting the pump back together again become a matter of concern for you then take a picture of the thing before disassembling it. That way, even if you end up turning it into a useless piece of hardware, you can order it from the vendor without any problem (by using the picture you clicked). If cleaning your indoor waterfall is too much of a task for you the reason is probably because the cleaning isn’t resulting in as clean a unit as it ought to. The cause for this is the material build up in tap water (hard water). To prevent this problem, use distilled water.
• Water level should be closely monitored. This is perhaps the most important aspect when it comes to looking after your waterfall pump. If you ever come across your indoor waterfall pump making strange gurgling noises, switch if off immediately! Chances are (99%) that the sound is being made due to water and air being sucked in by the pump at the same time. This occurs when the water level of the unit goes beyond a critical low. The pump is unable to draw sufficient amount of water for its proper functioning and, thus, air gets sucked in. This can cause the pump to heat up and thereby ruin its working capability. It can also lead to unwanted eventualities. To prevent damage to the pump (or any other sort of mishap) always keep the water level such that the pump remains submerged.
  This involves watering the indoor waterfall on a regular basis (recursive or redundant as that might sound)!
• Change the water of the waterfall. Make sure you clean and drain the water in your waterfall every four to six months. Manufacturers always recommend using distilled water instead of water from taps. Mineral deposits contained in tap water have a tendency to clog the fountain openings and may even affect the pump's ability to work efficiently. In case distilled water is not available, the water should be treated with appropriate cleaning agents from time to time. For example, Fountec is a product that is highly effective in the prevention of algae without harming the environment and animals. It is resistant to heat, sunlight, and evaporation. As Fountec happens to be highly concentrated by nature, a small dose is recommended and it is enough to serve the underlying purpose. Protec is another product used in maintaining the beauty of fountain surfaces. Consisting of a mixture of advanced organophosphates, it serves to protect against white calcium mineral buildup and metallic stains. A single dose can last up to a month or even longer.

Thus, it is not really tedious work but meticulous planning and keen observation that ensures your waterfall’s pump has a hassle free operation. After all, an investment into a thing as aesthetic and pleasing as an indoor waterfall should not go to waste due to negligence, should it?