How much is a 20 cubic meter of steel storage tank?
A 20 cubic GRP storage tank is probably between 23000~30000, which is general and has no special requirement. I suggest you go to central chemical to see, their prices are also affordable, I have bought several times in them, but also.
If it is stored water, not invoiced about 30 yuan a kilogram, glass fiber reinforced plastic density of about 1.1. Count yourself.
It depends on your FRP storage tank is used to put what medium, where to put, thickness requirements and so on a series of problems.