Pentair Frp Vessel 

Standard polyester or chemical-resistant vinylester construction
Easy to handle and install
10-year assurance for 6″ to 13″ vessels (softener/filtration applications)
5-year assurance for 14″ to 16″ vessels (softener/filtration applications)
Pentair
Safety factor: 4:1
Minimum burst at 600 psi
Tested to 250,000 cycles without leakage
NSF
Safety factor: 4:1
Minimum burst at 600 psi
Tested to 100,000 cycles without leakage
Residential tanks 6″-16″ in diameter square measure Certified

to National Science Foundation forty four.