These Versa Gold Series epoxy encapsulated Beckett Pumps have been designed for longer life in continuous duty applications, such as waterfalls and water gardening. These pumps are recommended for statuary and other clean water applications but are a great choice for small ponds when used in combination with a foam filter. We suggest the M.A.N. internal biological tub filter #3 for the G210AG20 and the G325AG20 and the M.A.N. internal biological foam filter #1 for the G535AG20.