no, i don`t think so.......coz v too had the same doubts but builders has a very convincing reply, he said that they have purchased a very thick 5 or 6 inches of pipe for manjeera water and i have been told that they completed the entire construction only through manjeera water, they did`nt even touch the bore water....my home construction is a very reputed builder, i m sure they wud have taken the appropriate steps to erase this types of problems..........no, i don`t think so.......coz v too had the same doubts but builders has a very convincing reply, he said that they have purchased a very thick 5 or 6 inches of pipe for manjeera water and i have been told that they completed the entire construction only through manjeera water, they did`nt even touch the bore water....my home construction is a very reputed builder, i m sure they wud have taken the appropriate steps to erase this types of problems..........