[Jakey boy]

WCW sell isopropyl for anti freezing, but surly this causes spotting? Or not? If not then why don't we all use it in out tanks to stop things freezing?

[Dave Willis]

Because you'd have to use an awful lot of it to prevent freezing at the lower temperatures. TDS is zero so shouldn't cause any spotting. My container of it reads 001 in neat form but that is most likely because I had a different chemical in there before.

[Jakey boy]

Because you'd have to use an awful lot of it to prevent freezing at the lower temperatures. TDS is zero so shouldn't cause any spotting. My container of it reads 001 in neat form but that is most likely because I had a different chemical in there before.

Let's say 400l of water, I'd have thought it wouldn't take much to prevent freezing up to -2 or -3? Wonder if the di vessel would be effected in anyway..

Might be worth using occasionally...

[SeanK]

Because you'd have to use an awful lot of it to prevent freezing at the lower temperatures. TDS is zero so shouldn't cause any spotting. My container of it reads 001 in neat form but that is most likely because I had a different chemical in there before.

TDS is only a measure of conductivity and just because a product has zero TDS or conductivity doesn't mean it wont spot
on glass.
Sugar is an example of this, dissolved in water it has no TDS reading but will leave spots on glass when the water dries off.

[Dave Willis]

Ten percent freezes at - 4     http://www.engineeringtoolbox.com/ispropanol-water-d_988.html

Can't say I've ever tried sugar in my water.

[SeanK]

Dave was just pointing out that you need to be careful when using TDS as a reason for something other
than purified water not to cause spotting.
Not saying that Isopropyl will as I know nothing about it.
The sugar was only an example of something that doesn't show up on a TDS meter.

[Dave Willis]

I didn't know that