What is the inside diameter of your pipe? It looks fairly small.
There is an enormous difference in flow with only a small increase in radius - exponential - also, as said before, a Mag 2 isn't very powerful.
Unions, els, valves - all fittings - reduce flow. It looks like you have a lot of connections - also, all non-glued connections introduce the possibility of air leaking in giving you microbubbles. You might find that if you hook this up to a more powerful pump, you might get a lot of microbubbles.
Gluiing PVC is not nearly as bad as it sounds. If you cut all your pieces first, it doesn't take long. If you are as messy as me, consider getting clear primer instead of the usual purple stain. Use the least number of 90s possible (a gentle curve has less pressure effect than a 90) and use a decent size pipe.
RC has a lot of resources for novice plumbers like me, which were really helpful.
Good luck.
John
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