Monday-Friday, Call for Quote. ZTERS provides dumpster rentals, portable toilets, fence rentals and more. Portable toilets are great for special events and construction sites. Construction site porta-potties are serviced weekly and billed on a monthly basis. Zters also provides all types of commercial dumpster services and roll-off dumpsters. Roll-Off dumpsters vary in size from 10 yards, 20 yards, 30 yards, and 40 yards. Roll-Off containers can be used for jobs as small as a garage clean-out or as large as a complete home remodel. Commercial dumpster containers vary in size and pick-up frequency. A 2 yard commercial dumpster could be serviced as little as once a month while an 8 yard may be serviced as often as everyday.