Kountryguy wrote:
When flushing my toilet, I glanced down the pipe and saw some kind of off white gel like substance growing on the pipe. I took a stick and then a brush and scraped it off.
Now about a month later, same thing. Any ideas what it may be or what is causing it?
It could be Denaturing Gradient Gel Electrophoresis which is very common in drains but often so small it goes unnoticed since it's usually out of sight. Removal is simply by cleaning or using one of the commercial biofilm removers. But since you mentioned it reoccurring in only a month, either you have or are using some polluted/contaminated water in the RV or someone using the toilet is on certain RX's that are known to promote DGGE if it comes into contact with bad water. Since you mentioned it was only in the toilet, that rules out the more common causes as it's far more common in regular bathroom sink drains. I would start with testing the water to see how grungy it really is.