These bottom drains are great for reducing the build-up of sludge in your pond. Use with a gravity-fed filter & install in the deepest part of your pond with the area around them 'dished' to draw water & solids to your filter. Best fitted during construction & suitable for concrete/fibreglass or a liner. Available in two
Sizes: Small
- 4 x 2" (fits 2" Pipe) Large
- 9" x 4" (fits 4" Pipe) "