Water treatment equipment: Controller
pH Meter Kit, pH Pen Tester for Water - AC Infinity
ProsystemAqua's pH & Ec Controller
TruDose Chemical Controller
The BL100 pH Controller and Dosing Pump is a system engineered for maintaining the pH of swimming pools, hot tubs, and spas.
pH Controller and Dosing Pump BL100
The Important Role of pH Levels in Water Treatment - Blue-White Industries
Integrated Aquarium Controller - INTAQO
Milwaukee MC122 PRO pH Controller
AnyLeaf articles: Project: Building an automatic pH doser