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You could use pvc with the two rows of holes and then pitch the pipe fast enough so that the clay does not fall out of solution.
Speed is the mechanism that will hold the clay in the water. Once it slows down, it falls out. I saw some socks get clogged when I worked in Idaho. That is where I learned to hate flexible perforated pipe. There was a lot of clay and silt. One thing that we did was to use a stone with fines in it (5/8"-) rather than drain rock for back fill. That seemed to keep the drain pipes from clogging, and kept the face of the walls clean when they wept. The soil there was hard as a brick when it was dry and melted like ice cream when it got wet. A shovel full weighed a hell of a lot more than anything you can put in a shovel on the sand bar that I live on now.
I think some of the reason why the water ran clear through the 5/8- was that the particles were so close together that the water dispersed over the whole interface rather than following any one path of least resistance. That is what it seemed like, but it might not be the same situation where you are.
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