I have inherited a toilet (pictured). In the tank, the level -- to which the water currently fills -- is indicated by the red arrow. There's an old water-level stain at a much higher level (green arrow) which seems to be the level to which the water used to fill at a prior time.
It appears that the flush-valve system was replaced at some prior time, and the water started filling to the lower level (red arrow)
Currently, the amount of water per flush is lower than I prefer, and I would like to raise the water level back to the original level (green arrow).
My question: is it possible to adjust the flush-valve system to do this, or will I need a new flush-valve system. If the latter, your advice on something I can easily get from Menards / Lowes / Amazon will be appreciated.
Tank brand: Mansfield, No. 160, Bush Valve Model 211
Current Flush-Valve brand: Korky