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I fought with that issue, in my case it was the high temp silicone tubing connecting my false bottom to the spigot collapsing under the weight of the grain bed.

What setup are you running? False bottom? Ss braid? Slotted manifold?

What was your grain bill also?
 
ss braid but i wrapped it with a muslin sock. worked great on first batch, but this time it took like a hour to run.
 
Take the muslin sock off the braid. You should be OK setting the grain bed by doing a vorlauf then draining. The grain husks do most of the filtering. The braid keeps them from coming through the valve.

Are you doing a batch sparge or fly sparge? If a fly sparge it should take quite a while.
 
It sounds as though you are dealing with a stuck sparge. This happens a lot if the grain is crushed too fine or if you are not getting a good slow vorleuf.

I would first look at the crush and if it is too fine, make an adjustment. When you vorleuf be sure to go slow and allow the grain bed to settle slowly and do this a couple times, then drain, the grain bed will act as a filter.

The muslin sock may be too fine and causing blockage as well. Sometimes its better to let a little debris through and get a good running then to try and get every bit of grain trapped.

Another thing to look at is the grain bill. If you are doing wheat or flaked, sometimes it pays to add some rice hulls to the bill to keep things loose.
 
A few ounces of rice hulls can go a long way in preventing a stuck sparge. I've started usjng 4-6oz in my batches (depending on how much grain I'm mashing).
 
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