In the 25 years that Steve and Astrig Tanguay have owned Searsport Shores Oceanfront Campground, recreational vehicles have undergone a dramatic transformation, ballooning from modest, 22-foot trailers into 48-foot fifth-wheel monsters with super-sized waste tanks to match.

The campground is still the same size, so when the couple decided to upgrade their septic system, they had to get creative.

On Nov. 9, Matt Page and Lacey Fuller of Brunswick-based Maine Septic Solutions delivered a Fuji Clean system, imported from Japan, where, as Steve Tanguay describes it, space is limited and water is all around. Using a crane, they placed it between a pair of settling tanks and a leach field that exists mostly to satisfy regulations written for traditional septic systems.

The Fuji Clean comprises a van-sized, white container that looks vaguely like a giant trio of conjoined motor-oil bottles with green screw tops. Inside, a system of three chambers subjects wastewater to aerobic and anaerobic processes that remove nitrogen, suspended solids and other junk that traditionally would be filtered by a leach field. What comes out the tail end, according to Page and Fuller, is essentially rainwater.

The new system will replace three existing septic systems at the campground and will treat a larger volume of wastewater in a smaller space.

"This place would have a football field of a leach field otherwise," Lacey Fuller said.

Maine Septic Solutions is the state's only distributor of Fuji Clean systems. The company has installed about 300 in Maine, ranging in size from two-bedroom-home models that fit in the bed of a pickup truck to 6,000-gallon models for hotels and condo complexes.

The system at Searsport Shores will be able to process up to 2,000 gallons of wastewater per day, and it will have the niche distinction of being the first of its kind installed at a Maine campground.