What size res. do I need for a 4x4 flood table?

[kingucci]

I have two 4x4 trays and two 30 gal res and never had a problem. You need an overflow on your tray, maybe 3/4" pvc pipe, it needs to be adjustable to the exact height you want the nutes to come up to. When the level comes up to your designated height, the water will flow straight down into the res again through the overflow. I run mine every 4hrs for 15 minutes, using a timer.
keylime

Hey, im now doing the 4hrs for 15. How many plants can u fit in this 4x4 table? Im using it for veg. How high do you get the nutes to? I have like 2in spacers and I think 6in x 5in pots. Im not sure I gotta check on that..