The “PW-Free” TrueDPD from ControlOMatic is a free chlorine colormetric controller sensor designed to eliminate fluctuation levels in sanitizer due to ORP changes. TrueDPD utilizes DPD technology to take accurate measurements without making users hand-measure free chlorine. Some health departments allow measurements from colorimetric measuring systems to replace manual ones measurements, per maker. Contact: 530.205.4520;

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