Under the right conditions, the City of Wausau, Wis., uses slip-lining as an alternative to cured-in-place pipe (CIPP) lining to rehabilitate aging sewer lines. It’s a double- barreled approach that lets this northern city slice the cost of specific sewer replacements in half. “Obviously, slip-lining isn’t feasible for every sewer in the system,” explains Joe Gehin, director of public works and utilities. “But where we are able to use it, we’ve found that we can save money.” Slip-lining uses high density polyethylene (HDPE) pipe, which the city purchases at about $3 per foot. A thermal bonding process joins the 40-foot
