There are some important factors to consider when you plan your reservoir project. Fish pond pump is the most critical part of the device, as it is to provide the necessary filtration and circulation, any of your attachments, you may want to install (such as ultraviolet sterilization, decorative fountains, etc.). Not only will you be strong enough pump, flow amount through the distribution of the filter must also be able to provide sufficient water pressure, makes you want to cascade waterfall.