Jandy TRUDOSE TruDose Chemical Controller. Simple, convenient chemical dosing. Keep your pool water continually balanced, even between service visits, with the Jandy® TruDose™ chemical controller. Engineered to maintain consistent water chemistry based on custom setpoints, TruDose uses advanced pH and ORP sensing technologies to constantly monitor levels as water flows through the pool’s plumbing — ensuring a clean, safe, and more comfortable swimming pool experience.