Metrop is a new groundbreaking concentrated liquid fertiliser designed by the original maker of Biogreen. This has further usage rates per bottle, comes in a complete set of 5 bottles and does not require warmer water than is usual for mixing well- merely mix/ agitate thoroughly. Biogreen customers wishing to move on to Metrop can do so bottle by bottle(ie not wasting any Biogreen).Please note: No Additional PK 3/14 is required with Metrop. Recommended for outstanding results.