The hot tub plunge pool

I changed the water in the hot tub on the weekend because they recommend doing it every three months or so. This time the water temperature out of the tap was 16C as opposed to the 7C we had in February and consequently it heated up much faster. However I knew we had a hot day forecast yesterday so I decided to heat it only to 28C and try it as a refreshing plunge pool which I did yesterday afternoon. Aberdeen reached 24C which is a heat wave for us and in the greenhouse with the door open (windows closed) it got to above 30C. With the hot tub plunge pool at 28C it was indeed a lovely and refreshing dip. Since it’s too small to really swim around I got cold after a bit which was nice. We’re returning to more normal cooler days again now so I’ll heat it up a bit higher although what I’ll settle on for summer I’m not yet sure. It’s easy enough to alter in any case. Can anyone guess what grain this is in the next photo? They are oats. Or more specifically, oats before any processing has…