Oxygenator plants live underwater and keep pond water clean and clear
Allow two portions of oxygenating plants per square metre of surface area.
The best all-year-round oxygenating plant in UK is Ceratophyllum demersum - Hornwort. Sent as bareroot portions (loose) as this submerged oxygenating plant floats freely in the water. Drop this into the pond to find its own depth. They do not come bunched or with added weights as the stems tend to snap. Available for the longest period of the year.