Okay, in looking back, I realized that I had earlier posted that I was using 2, 18 gallon rubbermaid storage containers with a manual float valve in the bottom unit. This float valve was designed for a reverse osmosis storage tank. Reverse osmosis is a notoriously slow process, hence the low flow rate for the valve.
As you can see, I've switched to a larger unit. When I actually assembled and tested this 2 reservoir design, I ran into a huge problem; that being that the float valve did not flow well enough to prevent a massive flood from my drain pump pumping water into the top reservoir. Ergo, I switched to the larger reservoir design which suits me better. Now, I can potentially leave town for a few days and not have to worry about running out of water and/or nute/Ph problems occuring since my reservoir is so much bigger and resistant to such changes.
