Hello everyone! I recently finished construction on an off-grid hydroponic system and wanted some input on buffered solution mixes. I have a graduate degree in chemistry so I know of a few solid ways to well-buffer a solution at a pH between 6.5 and 7.5 and am pretty well set on using dibasic sodium phosphate, adjusted with a small amount of phosphoric acid to achieve my desired pH. My first question would be, has anyone done this before and noticed detrimental effects. I am thinking of using a 10 mM buffer concentration.

This is my first foray into anything like this so I am interested on getting opinions. The system is powered by a 65 Ah deep cycle lead acid battery that is charged by a 100 watt solar panel mediated by a charge controller. The pump is an RV water pump. I control the system via a NodeMCU (a WiFi enabled microcontroller) that has a timed program that runs the pump for 30 minutes every hour. It is also controlled by my phone and capable of monitoring fluid level, pH (via a Silver-Silver Chloride electrode, calibrated every three days with 4.0, 7.0, and 10.0 pH buffers) and temperature.