My hydrominder was overflowing when I opened the equipment room today.
The valve was not working properly. When the water was on the water would just trickle out like the picture above left. When you simulated the float it worked fine.
I had a spare valve repair kit (Dultmeier Sales part number HR 6655K) and replaced the valve. Everything worked fine again. I also changed to Warsaw’s Radiance red high pressure soap. Because it sucked down the rest of my hand cleaner, I mean high pressure soap and foam brush soap.