This is where the longer pieces live. The water problems section answers one symptom at a time and the FAQ answers in a paragraph; an article here takes a single question and works it through properly — including where the answer stops. New pieces are published to this page as they are written, in the order they are written rather than all at once. Every piece is dated, and a piece is revised rather than quietly replaced when the position on it changes.
Water that leaves a treatment stage clean does not stay clean on its own. Between the last stage and the tap there are four physical places where water meets air, a surface or time — and none of the four is fixed by adding another stage.
An ultraviolet stage delivers light to water, so how far that light travels is decided by the water. What transmittance measures, why it is not turbidity, and why a rating has to state the water it was established in.
Two documents that look alike on a page and answer different questions: one is attached to a facility, the other to a named model and standard. What each one proves, where the common misreading happens, and four questions that settle it from the paperwork alone.
A dose in mJ/cm² looks like a specification. It is not one on its own: it describes a product together with the conditions it was measured under. What the four deciding variables are, what a number without its test conditions can and cannot tell a buyer, and why this site publishes none.
Six numbers, two dates and one common misreading. What is already in force, what is proposed and could still move, which supplies the rule does and does not reach — and why a treatment train decided on the 2029 date alone is decided on the wrong date.
The lamp is still lit, the indicator is still green and the water still runs — so nothing looks wrong. But ultraviolet has to reach the water, and a film on the sleeve is what stops it. How to tell fouling from a failing lamp, and what a cleaning interval should actually be based on.
Chemical disinfection keeps working after it is dosed. Ultraviolet stops the moment the water leaves the chamber, so it cannot protect anything downstream of itself. That single difference is the reason the last position on the line is the only position that answers the question most installations are actually asking.
A number without a source is not published
Where a figure would have to come from a test the manufacturer has not run, the article is written without the figure and says so. That is why some pieces here discuss a quantity at length and end without giving a value for it.
A gap is named, not left blank
A blank line in a specification usually means “ask us”. Here it means the information is absent, and the article says which of the two it is rather than leaving a reader to guess.
Enforceable and proposed are kept apart
Where regulation is discussed, what is in force and what is still only proposed are separated in the text, because the difference decides whether an installation has a deadline today or a planning assumption.
Product values, feed-water limits and the document position are on the data sheet, not in an article — an article is the wrong place for a specification, because a specification has to be a single source rather than one of several. Installation procedure is in the installation guide, and the treatment of a specific contaminant is in water problems.
Articles are written from questions that came up more than once. If yours has not been covered, send it — the reply is more useful when it includes the line you are working on and the market you are working to.
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