Almost everyone who buys an indoor fountain loves it for two weeks. Then the water goes cloudy, a green film appears on the stone, the pump starts making a noise, and within a couple of months it is unplugged.
That trajectory is entirely avoidable, and none of the fixes take more than a few minutes. Here is what is actually happening.
What algae needs, and what it does not
Algae requires three things: water, light and nutrients. You cannot remove the first, so the entire strategy is about the other two.
Light is the dominant factor and the one people never consider. A fountain on a sunny windowsill will green up within days, while the identical fountain three metres into the room may stay clear for months. If your fountain keeps going green, move it away from the window before you try anything else.
Nutrients are what feeds it, and they arrive in ordinary tap water, in household dust, and in whatever gets dropped in. This is why fountains in kitchens do worse than fountains in bedrooms, and why one that has not been cleaned for a month goes green faster than one that has.
The water you use
Distilled or deionised water dramatically reduces both algae and limescale, because it contains neither the minerals that feed the first nor the ones that deposit as the second. It is inexpensive and available anywhere that sells car maintenance products.
If you use tap water, expect more frequent cleaning. Filtered water is a middle option and better than nothing.
Limescale, which is a specifically British problem
Much of southern and eastern England sits on chalk and limestone, which makes for hard water, and hard water leaves scale wherever it evaporates. In a fountain that means a white crust on the stone at the waterline, on the pump housing, and eventually inside the pump itself.
If you live in a hard water area, distilled water is not a refinement, it is the difference between a fountain that lasts years and one that seizes up. You can check your local water hardness with your supplier, and most of them publish it by postcode.
Cleaning without damaging the finish
Empty the fountain, remove the pump, and wipe the surfaces with a soft cloth or a soft brush. For light algae, plain water and a brush is usually enough.
For scale, a weak solution of white vinegar and water works and is the gentlest effective option. Apply it to the affected area rather than soaking the whole piece, leave it briefly, then rinse thoroughly. Test on an inconspicuous area first, since acid can dull some finishes.
Avoid bleach, avoid abrasive pads and avoid anything scented, which leaves residue that then recirculates. Rinse everything properly, since any cleaner left behind ends up in the water you run for the next month.
The pump, which is what actually fails
Pumps in tabletop fountains fail for three reasons, all preventable.
Running dry is the commonest killer. These pumps are cooled by the water they move, so a fountain that evaporates below the pump intake overheats within hours. Top it up regularly and never leave it running while you are away for a fortnight.
Debris is the second. Dust, hair and mineral fragments get into the impeller and either jam it or wear it. Most pumps have a removable cover over the intake, and rinsing that every time you change the water prevents most of it.
Scale is the third, and it builds inside the pump housing where you cannot see it. Soaking the pump in weak vinegar solution occasionally, then rinsing thoroughly, keeps the impeller free.
A routine that actually works
Top up weekly with distilled water. Change the water and rinse the pump intake monthly. Do a full clean with a vinegar solution every two to three months, or more often in a hard water area.
That is around ten minutes a month, and it is the difference between a fountain that runs for years and one that becomes an ornament.
Which of ours suits which spot
Smaller pieces such as the 21.5cm golden Buddha pots suit a side table or desk away from the window. The larger 30cm golden Buddha lotus and the cascading lotus pots work as a focal point in a living room, again ideally out of direct sun.
Our full range is in tabletop water features, and the damp question is answered honestly in do indoor water features cause damp.
Questions people ask
Why does my indoor fountain go green?
Algae, fed by light and nutrients. Light position is the dominant factor, so move the fountain away from direct sunlight before trying anything else.
What water should I use in a tabletop fountain?
Distilled or deionised water, which contains neither the minerals that feed algae nor the ones that deposit as limescale. It is inexpensive and makes a large difference, particularly in hard water areas.
How do I remove limescale from a fountain?
A weak solution of white vinegar and water applied to the affected area, left briefly, then rinsed thoroughly. Test an inconspicuous spot first, and never use bleach or abrasive pads.
Why do fountain pumps stop working?
Running dry is the commonest cause, since the water cools the pump. Debris in the impeller and scale inside the housing account for most of the rest. All three are preventable.
How often should I clean an indoor fountain?
Top up weekly, change the water and rinse the pump intake monthly, and do a full clean every two to three months, more often in a hard water area.
