Originally Posted by Rogerh
Almost like a red Georgia clay like stuff. I thought it could be rust but it really does not seem to be that. Is there some sort of algae or other item that can grow that looks red?
Originally Posted by ulysses
Manganese. It is naturally occurring usually twice a year in many public water systems.
Or maybe it could be either clay or rust, if the marina's water supply is from a well.
FWIW, we trap a combination of both clay and iron in our sediment filters at home. Per well guys who were just doing a periodic cleaning last Friday.
Here at our marina, their well seems to have just a little iron (probably) but no clay.
Unless it's manganese
There's a relatively recent big thread about water filtration on CF.