How long is the Warranty on your Big Water Tanks?
XPRESS tanks have a 10 year warranty.
This is the industry standard warranty for smooth walled tanks.
Smooth walled tanks should not be buried. As with all smooth walled tanks your warranty will be void if you bury the tank and the side wall collapses due to external pressure.
PROMAX corrugated tanks have a 20 year warranty.
PROMAX tanks can be buried up to 1 metre in the ground and still retain their 20 year warranty.