Gave up on putting it into a blue barrel as for me to get the angle right, the trough would have had to been really far to one side of the barrel. Wasn't sure if I could do that with the Uniseals as they would have been at quite an angle due to the roundness of the barrel. I opted for making the trough out of 3 inch PVC vs. 2 inch, and putting the sieve in squarish tub I picked up at Dollar General for about $9.00. I will just drop the flow in via gravity through the top instead of plumbing in my intake pipe through the side of tub.
This is part of a vary small inside system of only 150 gallons for the circular fish tank. The water flows from the bottom drain and the skimmer and simply drops via gravity onto the sieve filter. Solids are directed to two sock filters and the rest of the water drops into a moving bed filter directly under the sieve filter. All the water minus most of the solids are then pumped to the bottom of a downsized Birdman Sand and Gravel filter, and then over flow is back to the fish tank.
I will tell you it was quite a challenge using the Uniseals in a thin walled tub. Shoving the trough through the Uniseals even well greased with vaseline, caused the tub to flex a lot which made things more difficult to line up the edges of the trough on the inside vs. the closed part of the PVC on each side. The transition of one side of the half cut out for the trough wanted to catch in the Uniseal.
Will attach a squarish garbage can to the side for two sock filters soon. Tomorrow I am going to put the plumbing together.
The 200 micron sieve screen I bought used from a member on this site. Thank you once again Koiphen! You people are the best!