The phrase "a tank from which" is correct and usable in written English.
It can be used to describe a tank that serves as a source or origin for something, often in contexts related to liquids or gases.
Example: "The fish were kept in a tank from which the water was regularly filtered to maintain a healthy environment."
Alternatives: "a tank that supplies" or "a tank serving as a source".
This system comprises a Continuously Stirred Tank Reactor, a surge tank and a settling tank, from which a fraction of treated water is recycled back to the reactor.
It looked like a scuba tank, from which extended a hose with an attachment that Maria expertly maneuvered over the carpeting, along the ceiling and around corners.
But there is a fish tank, from which he can pluck live lobster and fish.
In the transfer process, the bottle-fermented wine is transferred, under pressure, to a second tank, from which it is filtered and bottled.
Felix Baumgartner, the Austrian daredevil who jumped to Earth from a helium balloon in the stratosphere last year, crossed the English Channel in 14 minutes using a wingsuit, albeit with a 6-foot carbon fin strapped to his back and an oxygen tank from which to breathe.
In a vacuum sewerage system, sewage from one or more buildings flows by gravity into a sump or tank from which it is pulled out by vacuum pumps located at a central vacuum station and then flows into a collection tank.
Using filters from anesthesia equipment, he built a back-mounted tank from which the diver inhales pure oxygen.
Peering through the cinder-block wall, reporters could see spots where investigators seemed to have dug into the ground, and there appeared to be an empty steel tank from which sections of metal had been excised with a metal cutter.
It is an experimental think tank from which we each draw new musical ideas and creative inspiration," Thakur said.
Needing water for dust control, they filled a tank at a well 5 miles away on the valley floor, then trucked 3,000 gallons at a time to another tank from which they pumped it in a new pipeline up the mesa.
Indeed, NASA has already made some key changes, like redesigning the portion of the external fuel tank from which a chunk of foam broke off and damaged the shuttle's wing.
