My Form Wash was losing a liter of isopropyl alcohol every week and it made my office stink (the wash is right next to my desk) so I found a not-so-elegant solution that’s actually been great. I drain my Form Wash after each use.
This is fine for my print frequency since I’m only doing 1-2 prints a week. I wash, then use the included pump to get most of the iso into the carboy, then pop the tank off the wash and tilt it to pour the remaining iso into my carboy. Now one fill of the tank has lasted me months instead of weeks.
The McMaster part number for the 5 gallon carboy I use (pictured) is is 43005t3. The 2.5 gallon carboy (45005t2) will empty the tank no problem but I like the extra capacity and I typically keep 12 liters (16 bottles) of iso in the carboy so it will not get diluted with resin as quickly.
Edit: there may have been a slight exaggeration on the iso loss. That said I needed to top it off almost every wash which for some reason was more annoying than draining/filling it.