Typically, a galvanized piping system can last 30-50 years before you will begin to notice poor water quality. Some galvanized systems have started to deteriorate in as little as 3 years; others are 75 years old and look almost new. Lots of factors affect the lifespan of a water system, including the quality of the pipe material and the water quali

Most likely, you will have to remove the drain flange from the drain. It will have cross hairs, where you can unscrew it using a tool called a spud wrench. If you do not have this tool you could try using the handles of a channel locks. If you remove the drain flange, remove the old systems putty then continue to remove the clog. When you are ready

Here are some of the best drain cleaning brands are - 1) Green Gobbler 2) Bio-clean Enzyme 3) WPNAKS 4) Thrift 5) Remelos 6) Drano Max 7) ComStar Pure Lye.