How to clean a Kerdi Drain - A step by step process
by, 06-13-2012 at 05:43 PM (4639 Views)
I was asked to clean up a two bedroom condo up in Whistler not far from my North Vancouver home this week and thought I would share this process with anyone keen enough to tackle the cleaning job of a Schluter Sytems Kerdi drain. The strainer portion of the Kerdi drain comes off easily with just a philips screwdriver unless the tile setter grouted the screws over like the one I worked on.
To access the screws first I used the tip of a sharp drill bit to loosen up the dried grout. This should be done when installing the strainer but was not years ago when this shower was built. Once I removed the excess grout I used a philips screwdriver and untwisted the screws. Careful you don't drop them since they are stainless steel and if they go donwn the drain you will not retrieve them with a magnet.
With the cover removed you can see the nasty junk that had built up inside the drain, out of sight from the user. This is nasty old shower scum, some soap and some hair - all blended into a crusty mess. I used a rag to pull away as much as possible. Yuck.
With the strainer I decided to soak it overnight in a small dish of dishwashing soap and warm water. You can see how much black scum or mold was building up on the bottom side of this strainer.
After this was soaking I acid washed the entire shower and was careful to not let the acid sit on the strainer base of Kerdi drain for to long. Strong cleaners can stain the stainless steel Kerdi drain. I neutralized the acid with multiple fresh water rinses and called it a day.
The next morning I scrubbed the drain with a glass scrubber and it shinned right up. I chipped away little bits of grout with a screwdriver end (standard) and then shined it up with a SOS pad. Turned out great.
Before re installing the screws I used the same glass scrubber brush to clean the inside of the shower drain. I used just soap and water and the drain looks brand new. This drain shows a black inside which is ABS but your drain might be grey and made from PVC. Taken care not to drop the screws down the drain I re-installed the Schluter cover and was done.
The acid cleaning removed some of the efflorescence around the Kerdi drain but not all of it. The shower was poorly built and I will be suggesting we re-grout this shower to make some repairs and fill in missing grout.
Below is a photo send to me by a man who's contractor stop returning phone calls. His shower drain in need of cleaning but after unscrew the two screws he found himself with a Kerdi grill that does not come out.