More gadgets!

Image(1239),
originally uploaded by Hongyee.

Hahaha ... my new pH controller!! =D I'm not quite ready to invest $80 in a solenoid valve yet, but once I do, the whole setup will be quite automated - no more tinkering with calcium, carbonate hardness and pH anymore! The controller will shut off the CO2 supply to the calcium reactor via a solenoid valve once pH drops to a preset value, thereby raising it back up.