Roberto your shower drain makes the second Kerdi Line drain I've seen with rust issues. After the first one I scratched the channel body of my Kerdi Line drain with the words. "Does a Scratched Kerdi Drain Rust".
I tested it for over three weeks. No rust seen.
I did not how ever test the tile insert grate. Is there a chance that is transfer from some pipe cutting. Or a piece off a box cutter blade?
I'd sand out the rust and buff that bitch out. Shitty.
Is that a point for me? Do I get a bonus point for naming the drain and the grate option?
Roberto here is a copy of an email I got from someone at Schluter a while back. I asked about rust in a linear drain of theirs....
Hi John,
Difficult to offer much input without knowing the nature of the application (e.g., any chemical exposure, types of cleaners used, etc.). Our general response regarding the issue of stainless steel corrosion is as follows.
"Stainless steel is the name given to a group of corrosion resistant and high temperature steels. Their resistance to corrosion is due to a chromium-rich oxide film which forms on the surface. When ordinary carbon steel is exposed to rain water, for example, it corrodes forming a brown iron oxide, commonly called rust, on the surface. But when enough chromium (more than about 10%) is added to ordinary steel, the oxide on the surface is transformed - it is very thin, virtually invisible and protective in a wide range of corrosive media. This is what we call stainless steel. There is a common misconception that stainless steel is corrosion proof. It is in fact very corrosion resistant. It needs to be cleaned periodically to avoid the buildup of dirt, deposits, etc. that can interrupt the chromium-oxide film and make the material much more susceptible to corrosion, particularly in harsh environments.
Our Profiles Data Sheets state the following regarding maintenance of stainless steel:
“Stainless steel surfaces exposed to the environment or aggressive substances should be cleaned periodically using a mild household cleaner. Regular cleaning maintains the neat appearance of stainless steel and reduces the risk of corrosion. All cleaning agents must be free of hydrochloric and hydrofluoric acid. Stainless steel surfaces develop a sheen when treated with a chrome-polishing agent."
Stainless steel corrosion can be removed from the metal with Naval Jelly or similar products."
Hope that helps,
After the service call of mine I never heard back from the people.