older drinking fountain filtration setup

This photo was taken in March, 2023. This drinking fountain is the closest to the varsity baseball field. Notice the filtration equipment (small box, piping) to the left of the drinking fountain. I do not know when it was installed, but the small box and piping has been painted the same color as the wall behind it. This signifies to me that there has been a filter there since at least the last time the area was painted.