Why There Is No Single Way to Measure COD — and What That Means for Your Water Monitoring Programme
COD appears on every wastewater compliance report, but the number means something different depending on how it was measured. Wet chemistry and UV254 absorbance are not interchangeable — and understanding the difference determines which method is right for your programme.
PTSA, Tagged Polymer, and Fluorescein: Understanding Water Treatment Tracer Chemicals
PTSA, tagged polymer, and fluorescein are all used as tracers in water treatment programmes, but they serve different purposes and require different measurement methods. Understanding the distinction is essential for correct programme monitoring.
Bare Gold Electrode vs Membrane-Type Sensors for Oxidizer and Reducing Agent Measurement
Most inline chlorine and oxidizer sensors on the market share the same weak point: a membrane. It sits between the electrode and the water, and it’s also the part that dries out, fouls, tears, and needs replacing every few months — usually right when a plant can least afford the downtime. Pyxis built its ST-765SS […]
Dipslide vs Petrifilm vs Laboratory Analysis: Which Microbial Test Should You Use?
A cooling tower, a metalworking fluid sump, and a boiler feedwater line all have the same underlying question: how many bacteria are in there right now, and does someone need to act today? Three tools answer that question at very different speeds, costs, and levels of precision — the dipslide, Petrifilm, and full laboratory analysis. […]
Conductivity vs. Fluorescence for Sugar Leak Detection in Boiler Condensate
Sugar mills have relied on hourly manual condensate sampling for decades, precisely because a sugar leak into boiler condensate is expensive and dangerous to leave undetected. The problem is that manual sampling and conductivity-based online monitoring share the same underlying weakness: neither one is sensitive enough to catch a leak while it’s still small, so […]
Condition-Based vs Outcome-Based Cooling Tower Water Treatment: Measuring the Result Instead of the Recipe
A cooling tower can run within every setpoint on the controller — conductivity in range, pH in range, ORP in range — and still be forming scale, growing biofilm, and corroding the heat exchanger. That’s not a contradiction. Conductivity, pH, and ORP were never measuring those failures directly. They were measuring conditions that make those […]
Why Wait Until Algae Is Visible? Early Chlorophyll-A Detection in Cooling Tower Water Treatment
Algae is one of the few cooling tower problems a water treatment provider doesn’t strictly need a sensor to find — green slime on the basin walls or a film across the fill media is visible to anyone who looks. That’s exactly the problem. By the time it’s visible to you on a service visit, […]
PTSA and Tagged Polymer Sensors: Two Different Things Being Measured, Not Two Versions of the Same Test
Ask most operators what a PTSA sensor and a tagged polymer sensor do, and the honest answer is usually “they both check the inhibitor.” That’s true in the loosest sense, but treating them as interchangeable misses why cooling tower programmes across Malaysia increasingly run both rather than picking one. They measure two genuinely different things. […]
Testing Tolyltriazole in Chiller Water Treatment: Color Disc Kits vs. Reagent-Free Handhelds
Closed-loop chiller systems protect their copper and brass surfaces with a passivating film built by tolyltriazole (TTA), and that film only works if there’s enough TTA in solution to maintain it. Let the residual drop without noticing, and copper corrosion starts quietly — no bleed event, no visible fouling, just slow metal loss on evaporator […]
Corrosion Coupons vs. Corrosion Rate Sensors: Why Waiting 90 Days to Find Out Is a Problem
Most cooling tower and chiller operators find out about a corrosion problem in one of two ways: a coupon comes back from the lab with a number that’s already 60 or 90 days old, or a leak develops and the corrosion has already been happening for months. Both are after-the-fact. Neither tells you what was […]