Turn the water off and remove any rocks, pebbles or other decorative pieces that may be inside your fountain. Toss out any debris such as leaves, twigs and insects from within your fountain.
Clean the inside of the fountain. Using a soft, non-abrasive sponge, scrub the inside of the fountain with a calcium lime remover. You can also use a mixture of vinegar and water to remove calcium deposits.
Remove the pump from the fountain and disassemble it. Calcium buildup can collect inside the pump, reducing its overall performance. Let the pump soak overnight in a bucket filled with vinegar or calcium lime remover. Allowing the pump to soak will help break up the calcium buildup and make cleaning easier. Use a toothbrush if necessary to help scrub away tough calcium deposits.
Completely rinse the inside of your fountain and pump with distilled water. Make sure to remove any residue that may have been left behind by the calcium lime remover or vinegar.