I'll explain. The STA-BIL Diesel Biocide is in a container of 16 fluid ounces. It is in its container that it jells up. Turning the container upside down, nothing happened. Seemed like it was solid. I don't know if it jells or messes up in the 5 gallon diesel fuel container that I dump about 0.6 ounces into for getting a 1,000 ppm mix. However, recently I had to drain the 5 gallon tank of the BX to try to run down the frequent plugging. I emptied the tank down into another container, by letting it run through the first stage filter. Upon tearing open the first stage filter, I only found a small fleck of something, maybe 1/8" or little more wide.
I then rattled around in the tank a chain, some nuts and sloshed in about a 1 quart of diesel periodically and dumping that. A few small things came with the diesel, but might have been in my collection tank before. .Couldn't pick these things out. I saw no jelled stuff in the 5 gallons I drained from the BX via its filter.
However, now I took the 12 oz supply container in the house to let it warm up. Gradually it became more fluid, but not totally for at least most of the day. I wonder if there is some separation going on. Passing a light through it, I see no separation.
I do not recall this 12 oz container of the stuff jelling up before, but most of the weather conditions were Summer temps.