Hi, we have come back from a week away in the van. While away we noticed there was a bad smell from the grey tank every time the dump tap was opened. Also in the van when one sink was emptied the other would smell. I'm thinking the wind pressure of the water running down is forcing the smelly air from the grey tank back up the other waste pipe. For example I empty washing bowl in kitchen sink the bathroom suddenly stinks.
What is a good thing to put down the sink pipes to clean those and in turn clean out the grey tank that won't cause any damage to pipes and connections?
What is a good thing to put down the sink pipes to clean those and in turn clean out the grey tank that won't cause any damage to pipes and connections?