Recently replaced an Autotrol 268L (large body, 1 1/4" distributor tube) with a Autotrol 268 1" (OK, 1.05). I replaced the entire distributor tube, bottom distributor is a fine mesh screen and top distributor that attaches to the valve body is also a fine mesh screen.

I did not remove the resin from the tank, just removed the old valve, pulled distributor tube out, and stuck new one down inside. Seemed to install fine without any problems.

Softener is 'softening' the water- went from unsoftened 12 grains down to 2-3 grains, but the problem is when running any tap in any part of the house, hot OR cold water, the water pressure starts out great, but within a minute or two, it drops severely. In fact, had to put the unit back in bypass, because you can't finish taking a shower the water pressure drops so significantly.

Removed the valve body from the resin tank, the little turbine wheel in the back spins freely, no sediment in the port, injectors and screens all clean, top distributor screen and bottom distributor screen all seem good. Distributor tube is free from obstructions...

Any ideas on what the heck is causing this rapid reduction in water flow after turning on a faucet? Bypass the softener and everything is great.