Explanation for Gradual Water Loss
My personal watercooling experience is limited to two gaming systems. The first was completed in 2011, and was only just replaced with a new system in May, 2019. The first was soft tubing and the second was (is) hard tubing.
Here's my question: What would account for having to occasionally, but continually, add water to what should be a closed system?
In the case of the soft-tubing system, I found that I had to add an ounce or two every, oh... 6 months, or so. In the case of this newer hard-tubing system, I find that I am adding water even more often than that.
In both builds there have never been any leaks. In both builds the fill-ports were properly sealed with a gasketed fitting.
In the first case the system was fully enclosed in one of Cooler Master's HAF Cases, (HAF 932?), and this new one is built on Thermaltake's Core P90 (so everything is out in the open and visible...)