Fibrophos is produced from burning the same consistent fuel source all the time. This means the physical quality and nutrient analysis of the product do not vary. It’s the same time after time. Fibrophos Ltd are members of the AIC and all product is sold under FIAS regulations so you may be assured that you get what is declared on the Statutory Statement which accompanies every load. Beware of other fertilisers which are not sold in this way.