water tank of no pollution, good shape retention, easy to install&repair, cost saving, long-term use. water tank SMC combined water tank is ... is over 30 years usage. SMC water tankSMC combined water tank is assembled by moulding single board, sealing , metallic structure, ... 0%5. Fiber glass content ≥25% Maximum distortion of side wall ≤0.5%, distortion of the bottom≤8mm.They meet the "water standard ...