Ok, I am moving right along with my first aquaponics system! Tank and GB's have been bought. I am almost done with the placement of them in my yard (just awaiting some wood to sit the GBs on).

Now I am planning ahead to my PVC purchases, and I am curious as to your thoughts on what SIZE pipe I should get:

- from pump to GB
- from GB back to tank

Now, let me give a recap of my system. I have THREE 45 gallon grow beds. These are being fed from a 110 gallon tank, and a 500gph pump.

My bell siphons are going to have 3/4" stand pipes.

Given that information, should I use 1" pipes to both deliver water to the grow beds, and 1" pipes to return the water back to the tank?

Or should I stick with a 3/4" size for the entire system?

I would think that obviously the larger the outlet pipes are leading from the GB back to the tank, the quicker the water will drain from the beds. Likewise, the larger the pipe feeding the grow beds, the faster they will fill up.

So with a 3/4" stand pipe for my bell siphon, what would YOU use for the rest of the piping, both for filling the grow beds and draining back to the tank?