POND FILTER SUBSTRATE(PLASTIC PIPE) AND LARGE BORE PIPE
A large bag of pieces of black, plastic, corrugated pipe,each about 3.5cm long x 2.5cm diameter, for use in a biological filter(came from a Cyprio filter), £10. About 30 feet of large-bore(about 3.5cm), flexible,corrugated plastic hose,useful for pumping out ponds & tanks, £10.