This document discusses problems with water seepage and porous concrete in clean water tanks and reservoirs. Typical problems include surface erosion, water seepage, porous surfaces, and difficulty cleaning inside and outside the tank. SikaTop Seal 107 is presented as a solution to seal and protect porous concrete surfaces, produce a watertight surface that tolerates cracks, and stops water seepage. The document outlines steps for solving clean water tank problems which include cleaning, repairing damaged concrete, and applying two coats of SikaTop Seal 107.