I used this sturdy, 15 gallon HDPE (High Density PolyEthylene) solution tank inside my house for a chlorine injection, water filtration system.
It measures 22" high by 14" in diameter with a large cap that you can fit your hand through if needed.
Originally purchased online from Clean Water Store, they currently sell there for $175.
It has several small holes drilled into the top surface where I mounted a injection pump with injection lines. They can be easily plugged if required for your application. Otherwise, it's in great condition.
Please contact me via text as I live in a remote area and may not be able to pick up a phone call.
I can meet up in Priest Lake, Priest River or Newport.