[smellyfeet]

We use Castrol Hysol EP soluable and after a couple of weeks of evaporation and topping up the refractometer reading goes off the scale.

I was told by Castrol and the rep that you shouldnt top off with neat water.

Is this true? Does anyone have any experience with this?

Thanks.

[Chuck Reamer]

Absolutely, the coolant stays as the water evaporates off. My coolant rep was telling me one of his customers added 35 pails of straight water in a month, with only a couple of mixed coolant. You will need to add water more than mixed coolant in some machines.

I have a mill with a 7 gallon reservoir and I add with about 1-2% coolant and it keeps the refrac reading at around 5%.

[Caprirs]

That is correct. Generally, only the water evaporates. The coolant tends to stay. Think about it like salt water. The salt does not evaporate with the water (well a little does). If all the water evaporates, only the salt will remain.

Here in Arizona where the summer temps are 100*+ and the humidity is 5%, I can replace 5 gallons of water a day in the machine. I also replace 1.5 gallons in me.

[Geof]

...I also replace 1.5 gallons in me.

Make sure you check with the refractometer so you don't overdo it.

[Caprirs]

Make sure you check with the refractometer so you don't overdo it.

What is considered ideal on the Brix scale?

[RICHARD ZASTROW]

Geof; As you know you can rehydrate with with copious amounts beer. It has been my experience that the liquid level is self regulating. As I've gotten more experienced (older) I do the regulating thing more often. lol

Dick Z

[Geof]

Geof; As you know you can rehydrate with with copious amounts beer. It has been my experience that the liquid level is self regulating. As I've gotten more experienced (older) I do the regulating thing more often. lol

Dick Z

We`are probably going to get lambasted for hijacking.

I find in hot weather, with the type and strength of beer I like to drink, intoxication tends to precede rehydration. You need weak Australian or New Zealand weasel **** for successful rehydration.

[smellyfeet]

Sorry, I have been on paternity leave for a couple of weeks. Thanks for your answers, I have just topped up using water and got the refractometer readings back on the scale (roughly 5%). One thing I found immediately is that the coolant clears from the windows more quickly now so the ops can see whats going on. Hopefully this will save us a few pennies too as the oil price rockets..... Thanks again.

Smelly.