PrimoPrep: pH-stabilizing the loop before final coolant
PrimoPrep runs the same conditioning mechanics as SysPrep and System Reboot — mixed into water and circulated through the sealed loop — but for longer, and for a different reason. Rather than lifting debris, it coats the inside of the loop and neutralizes the pH swing a large copper radiator introduces, which matters most in a mixed-metal system. Run it after SysPrep on a new build, or after System Reboot on a loop that already ran coolant — PrimoPrep is the final conditioning stage before your permanent fill.
PrimoPrep is not compatible with aluminium components. It is safe on acrylic, PETG and other plastics, rubber gaskets and O-rings, and all standard tubing and fittings.
Confirm the loop is leak-free first
PrimoPrep runs for three full days — pressure-test or run a paper-towel leak test before you mix anything. See the leak-testing guide if you have not done this yet.
A slow weep that is invisible in a 20-minute bench check can put real volume on a component over 72 hours of continuous circulation.
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