I'm sure I know the answer to this, but I want to confirm before I get too depressed about how big this project may be.
Our filter has a cap, o-ring and sand-drain plug, which I assume works the following way: the sand-drain plug keeps the sand in and the threaded cap keeps the water in. Take out the cap and the water comes out but the sand stays in. Take out the sand-drain plug and the sand comes out.
The dilemma is that after I re-installed the cap this spring, there appears to be a leak in the 'collar' above the cap, i.e. around the sand drain plug. I ordered what I hope are the appropriate parts, but now I realize that to change the sand-drain plug, I need to remove it. Ahhh...the light goes on, and then I realize that when I remove it, the sand will come out.
So, I assume I am faced with removing all the sand in order to change the plug. Even if the sand doesn't just pour out, I'm guessing enough will fall into/onto the threads that would cause problems if I try to install the sand-drain plug with that sand on there.
Am I right in my understanding of how this works?