Mitragyna speciosa is an evergreen tree that can grow to a height of 25 m (82 ft) tall and the trunk may grow to a 3 ft (0.91 m) diameter. The trunk is generally straight and the outer bark is smooth and grey.
Overall though, metal is a much better option than plastic. In most cases, it is much more effective and reliable, and the right choice of metal will avoid the pitfalls of rust or weakness. Aluminium, steel and stainless steel are the three metal gutter materials for guards that homeowners can choose from.
KG 8 KG 8 is a guard bed catalyst used for removal of arsenic. It is applied near the top of a hydrotreating catalyst bed to provide protection for main bed catalyst from the detrimental effects of As on catalyst activity. KG 9 KG 9 is a specialty guard bed catalyst developed for removal of scale and organic iron.