Descaled existing six-inch cast iron pool drain lines in preparation for lining; removed loose scale out of drain lines; lined approximately 45 feet from pump room in basement to main drain on North side of the pool; lined approximately 20 feet from open pipe on the south side of pool extending through the double wye connection and overlapping the first liner; and epoxy coated the wye connection and old cast iron pipe to the sump pit on both sides of the gate valve.