The water softener system I have is Kinetco.

One day I was taking a shower and my water pressure literally went dead.
I then checked the faucets throughout the house and most generated a
trickle. Even the lines to feeding water to the toilets were clogged.

I removed the screens under each faucet head and they were clogged with
some sort of grit. In the shower head, when I took it off, the grit was
yellow...maybe a tablespoon's worth. When I took off the faucet head in
the kitchen, the grit was green...it too had at least a tablespoon's
worth of the stuff.

I have filled up my bucket to mop the floors and after I tossed the
water and the water in the bucket evaporated, I noticed some of the
yellow grit at the bottom of the bucket.

Is this a problem with my water softener system? If so, is this
something I can repair myself or is it better to get someone from
Kinetco to fix?

The water coming into the house passes through a water filter. After
passing through the filter, the water goes into 2 cylindars...the look
like very large oxygen tanks. The water goes into the first cylindar
and is outflow is from the second tank sends the water to the water line
in the house. There is a large tub for the backwash. There is a valve
that connects between the input/output lines of the two cylindars. I
assume this is some sort of shutoff valve but for what...I don't know.
Should I screw it all the way in or all the way out? Will that help
until I get the problem fixed? Should my hot water system be drained?
It seems OK but I am sure some of the grit has headed it's way too.

Thanks for any input.