It is important to change filters when they have slowed the flow through the filter unit itself due to immovable saturation in
...Designed to operate at the pond floor the Oase Oxytex unit fed by the 1000lph air pump (supplied) ensures your pond is oxygenated sufficiently. It offers a comination of pond aeration, circulation & settlement surface. It supplies the pond with vital oxygen supplies. Its fibrous structure ensures that there is a high surface area for important micro organisms that decompose the nutrients.