Ethanol vs propylene glycol antifreeze

DonQ

Gold Supporter
LifeTime Supporter
Apr 25, 2014
29
Brookfield, CT
Does anyone have experience with ethanol-based antifreeze? I have been using propylene glycol-based in the past and have had some issues with high chlorine demand on startup.
 

cowboycasey

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LifeTime Supporter
TFP Guide
Jul 3, 2013
7,670
Southern OK
Pool Size
15000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
CircuPool SJ-40
propylene glycol-based is the only one approved and safe to be used in pool water... The other is for vehicles and not safe for the pool...
 

DonQ

Gold Supporter
LifeTime Supporter
Apr 25, 2014
29
Brookfield, CT
I don’t mean ethylene glycol based antifreeze, I’m talking about ethanol (ethyl alcohol) based antifreeze. Some are advertised as being for pool use and I was wondering if anyone had experience with them.
 

JamesW

TFP Expert
Mar 2, 2011
25,783
You can use either one. I suspect that the chlorine demand will be about the same either way. If you blow out the lines correctly, you can use much less antifreeze.

How much antifreeze are you adding?

I would recommend the propylene glycol based antifreeze.
 
Last edited:

JamesW

TFP Expert
Mar 2, 2011
25,783
That's too much. If you can get the lines blown out completely, there should not be a need for more than about one gallon.

Also, you can try to rig up a way to collect the used antifreeze during the opening instead of letting it get to the pool.
 

Newdude

Gold Supporter
TFP Guide
Jun 16, 2019
8,869
NY
Do you have a waste setting on your MPV ? I suck from my skimmers right to waste on startup and the only thing left is the gallon in the returns.
 

DorsalSpine

Gold Supporter
Silver Supporter
Jul 8, 2013
799
Columbus, Ohio
I usually stick a shop vac in the lines near the filter and open the plugs in the pool just a little to let water into the lines. I can suck out most of the anti-freeze that way.
 
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