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1st section - Drain into sump.
1st drain goes into fleece (siphon)
2nd drain - durso
3rd standpipe
Rubble rock for ampihods and other critters
2nd section - skimmer and trident area
3rd section - manifold , reactor (excuse the rock kept dropping screws in first section and had to move rock. So temp holding area )
- return wye for tank
4th section is the return which goes directly into uv and into manifold. All water will flow through uv (tangs !!! )