Well, I do add salt, but not as much as I should.
Sometimes, when I remember to check it (speaking of which, it has been a while) there's just a sludge on the bottom.
But other times it's halfway, and others even full.
But if it didn't have salt, then wouldn't my water be hard?
As for the valve, there's a little blue cylinder attached to the wall, a pipe coming from that, with the said valve on it, going into my (I think) iron filter, which goes to the salt tank, then to some other contraption, which then goes to the house.
That's why I think the valve is before the softner.
I'm assuming the blue cylinder is just a pump of sorts to get the well water.
I hope that all made sense...
And thanks for replying!
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