[Canadian Man]

Hey Tony,
The outputs are kinda 1" The pvc portion is plumbed in 3/4" and the grey output nozzles are I believe 1" but they are the slip over type fittings so the inside diamiter is same as 3/4" pvc.

If you closed one side and had the other side full open; then manually switched directions (i.e., opened the other side and closed the first side), what does this effect look like as the water flow changes direction? Do you get a sweeping motion of the "point of convergence" ?

Basically yes. This is the reason that I am getting the wave maker and I am going to have 1 mj1200 on each side of the tank and they will be alternating on/off at diffrent time. Idealy I would like to do this with the irrigation solenoid thing with the main closed loop pump but the mj/wavemaker way is much more affordable. I actually close one side fully for a minute or so and then do the other about once a week just to loosen up some of the detrius in the rock and sand.

... One more question. How come you used T's capped off at the ends, instead of 90-degree bends? Do you find this balances the outputs better the way you did it?

I used the T's for the exact reason that you suspect. The output was slightly uneven when I had one T and one 90. Now they seem to be exactaly even with their output.

Good questions! 8)