it is more the power pack than the chemical
older power packs arent sealed as well and get more condensation. With these old units, you start stronger so you can go longer between changing because they dilute so quickly
stick with 50/50 if it gets humid where you ****. Most tanks still arent sealed well. You can use the 2.5/1 on completely sealed tanks like on k-ways or newer sealed ****** units. I use 50/50 with all micromatic units
I wouldnt go any stronger than 50/50. You need water for system efficiency. Water can carry heat better than propelyne glycol. the water is doing the w o r k of moving the heat, the glycol keeps it liquid
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