You must have bought really cheap RV antifreeze or something, because a mix of 70% automotive antifreeze won't ever slush up at all even at -45 C (the coldest I have tested)....it's good to ~-60C according to the manufacturer at 70%.
Maybe you are way below -25 actually...what are you using to determine the temperature? And what are you using to cool the coolant? How many BTUs?
We will get this slush problem solved.
No need for distilled water when using antifreeze...you are not going to get any algae or anything.
Hmmmmmm
slush problem huh? I only had that when I used RV-water system antifreeze, or with too much water.
Ohh and do not try the -50 ice breaker washer fluid either. The evaporator gets all gel covered at ~ -30 C.
Are you positive you have a slush problem or is the problem that the coolant isn't pumping (viscosity/restriction problem) and you are assuming slush? Just want to be sure. I modded my block so there was no unnecessary restriction.