GRP is the abbreviation of Glassfiber Reinforced Plastic.GRP water tank can also be called FRP(Fiberglass Reinforced Plastics) water tank. GRP is mainly composed by fiberglass and resin which will directly determine the quality of GRP Water Tank. GRP water tank is assembled by standard water tank plates, our plates have 5 sizes for your choosing ,such as 2000*1000mm， 1500mm*1000mm;1500mm*500mm;1000mm*1000mm;1000mm*500mm;500mm*500mm;thickness is from 6mm to 22mm,6mm thickness plate is only for the upper cover of water tank.