Here is the 'plan'.  It has labels for all the pipes going in and out so we know what pump to connect to!  In the upper right - is a sketch of the mounting plans for the pumps.  We decided to mount the pumps overhead, so we could place the filters underneath, and reduce the overall floor space required.  There are 12 pumps!  5 for the skimmers, 2 for the bead filters, 1 for the 1500 tank, 2 for the waterfall, 1 for the wash-down jets, and 1 for the irrigation system. Meanwhile, we were connecting the plumbing in the back of the waterfall.  Here, we placed the bio-converter, and then filled the area surrounding the bio-converter with soil and plantings. The big 6" pipes are for bypassing the waterfall when the air is colder than the water, but still keeping the bio-converter running. The inside of the bio-converter.  The water is input at the bottom, dispersed by slotted pipes.  In the center you can see an air-stone array to keep the entire load of media turning over - rapidly.  The two big slotted pipes at the top are the out-flow tubes, and can pass the clean water either to the waterfall or back to the pond under water. Inside, we have placed true-union ball valves on EVERY pipe.  Any valve can be easily replaced in the case of failure, and water can be turned off right at the wall in case of any leaks.  An impressive array! We stared plumbing in the pipes and attaching them to the pumps.  Some pipes contained only air lines, and some were for electrical connections.  Trying to keep the whole thing from ending up as a mess was an ENORMOUS brain drain!  The pipes are pretty organized, and very few cross.  Everything is labeled in several places! We have two waterfall pumps (each 2 HP - capable of pushing 10,000 gph!), but after checking with the manufacturer, we knew we didn't need to run two big lines out to the waterfall.  But, we had to create a 'mixing-tube'.  So we can turn on either or both pumps at any time. 'The basement 'hole' is located right below the intersection of the two pipe racks.  Watching them stand on their heads to connect these pipes was great!' Here is a close look at some of the valves.  You can see pieces of brass sticking out from some of the pipes - these are compressor line fittings that are plumbed into the pipe.  This way, we can connect a large compressor in the fall to blow out the pipes to winterize the system! Nearly done with the connections, you can see the coils of pipe trying to go straight into the valves.  The table in the foreground holds our supplies - the all important 'map', the purple primer, and the PVC glue.  Note - when gluing all day in the basement - turn on a FAN, or the fumes will get 'cha! My favorite picture of the basement plumbing.  About 150 feet of 2", 50 feet of 1 1/2", and 20 feet of 3".  Plus unions, and valves, and fittings and LOTS AND LOTS of glue!  I think my fingers will be purple forever!  Note the use of the special long sweep 90-degree curves in Sched. 80 pipe to reduce head. Perhaps you wondered how the air lines at the back got connected?  Can you see the feet sticking out of the pipes?  That's Mike Glidden.  Luckily, he stays skinny from all the landscaping he does for a living!  Now the question is - how will he get out???