Can I run automotive antifreeze through the coil of the condenser in a Rotovap ?

I want to know if this is doable before doing the experiment since I will be using a regular water pump to push the antifreeze through the coil, I know antifreeze and plastic dont get along so I dont know if it will damage my pump or even if it would work at all.

If there is any other cheap option besides to automotive antifreeze please let me know

What is this “regular” water pump you’re planning on using?


Ethylene glycol/water mix is usual for industrial scale chillers.
The stuff made for this service has inhibitors to prevent corrosion but so does regular anti freeze.
Dowtherm SR-1


This is a pretty common method for people trying to get up and running on a budget. Some people use sump pumps for this application, i’ve heard of other people getting away with aquarium pumps. Keep it cheap, expect it to break. When you find one that works the way you want, buy a backup for when that one goes down. Also, HF insurance might not be a bad idea.

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Thanks man, thats exactly what I was looking for

My bad bro, I meant to say aquarium pump, since I use them all the time they are the regular pumps for me lol :slight_smile:


Look at the temp you want to run at. If you can swing it run a propylene glycol water mix. It’s food safe and won’t cause a big mess if you contaminate your feedstock with it. It’s still fairly cheap too.


I used a 15 gallon plastic tub for my reservoir along with an aquarium pump and plain water, I would just use frozen water bottles and a laser thermometer to check my temp. When the water bottles unfreeze take them out and put new ones in.
Pretty crude setup but it’s easy and it works.
It’ll be what you do when your chiller breaks anyway