E-Tank® is your cleanest, most economical choice for renting environmental mobile storage equipment. We offer: 21,000-gallon and 10,000-gallon certified clean frac tanks, 18,000-gallon certified clean weir tanks, 25-cu. yard vapor-tight metal lidded and tarp-top roll-offs sludge boxes, dewatering boxes, vacuum boxes, poly tanks and secondary containment units.