How much 10% HCL solution to use
I have a blackwater valve that appears not to close completely. The handle shaft sticks out about 1/2" farther than the Aux Tank shaft, so I think it's not seating completely. This started about six months ago. Also, when I remove the drain cap, there is always some flow of residual black water. Luckily, I wear gloves.
Reading the posts above, I want to try a dilute solution of hydrochloric acid; I use it in our backyard pool and have lots on hand and know how to handle the stuff. I have two questions:
1. How much 10% dilute solution should I make up? My blackwater tank has 37 gallon capacity and I want to make sure that the entire valve surface is covered.
2. Do I need to just expose the tank side of the valve, or should both sides be treated?
If both sides need treatment, I'm assuming that the outside drain cap--the one I remove to attach a drain hose--will prevent the solution from draining out while treating if I open the valve just a bit to allow the solution to fill the section behind the cap.
Thanks for your suggestions and help,
As far as I know, this is the oldest I've ever been.