Hook up a Recirculating Bath
Don’t just let your cooling water go down the drain. The water is clean. Recycle it by using a cooling bath. You can hook up condensers in series. One cooling bath can cool multiple reactions at the same time. So don’t forget to share!
For those who are on a tight budget, a do-it-yourself solution is just an aquarium pump with a bucket of water.
Change to Air Cooled Condensers
Air-cooled condensers are completely waterless. They appear to work for most common solvents. It is especially good for solvents that condenses close to room temp (Acetone, dimethyl ether, dichloromethane).
They have standard connections and can be used with regular reaction flasks.
They are also usually stackable, to allow for longer lengths without having to buy different sizes.
They can be cleaned in the dishwasher.
e.g. CondenSyn by Asynt
Trinity College Dublin has been testing these out and found excellent results.
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