Low-profile septic tanks from Den Hartog Industries are designed to provide safe and durable storage of septic system byproducts. The tanks are furnished with multiple fitting locations for a variety of plumbing configurations and two openings for buried lids or access/inspection risers. They are available in one or two compartments with capacities of 1,000, 1,200 or 1,500 gallons. They may be backfilled empty and have sectional ribbing designed to sustain vertical soil pressures of up to 500 psf at a maximum soil depth of 36 inches. 712-752-8432; www.denhartogindustries.com.