STEP 2 - draining and inspecting system

If your loop hasn’t been drained, then properly get ALL of your old coolant out of your system. For detailed help checkout instruction guide on proper drainage.

  • Inspect your loop and look for the following.

    • Is there staining or build up of old fluids?

      • If opaques or show fluids were used, thoroughly check your loop for any type of debris.

      • We recommend that if use any show fluids or visual fluids that you take your loop apart and follow Step 3 below.

      • If your loop looks clean with no debris or old fluid, and you feel confident that there is no old coolant in your system then skip step 3 and move onto Step 4.

      • Note: We always recommend cleaning hardware, but this is ultimately the choice of the builder and can lead to failed future coolant if skipping Step 3.

Step 3 - Cleaning Old Hardware

We know the pain of taking a loop apart and cleaning components, but it’s always the best way to ensure success for your future fluid. Often times people also think that their old hardware is ruined if a fluid fails and clogs a block, or makes a reservoir dirty. However, with simple disassembly and cleaning you can often get your blocks back to their original glory. Sometimes fluids can and will stain, but getting harmful debris out is what the main goal of cleaning your hardware. Below is a breakdown of each and every step.


Dissemble your blocks and hand scrubbing them until all of the previous coolant is off the blocks. Below are some tips and tricks on cleaning blocks.

  • We recommend using a toothbrush and regular non sent soap or our system soap when cleaning these blocks.

  • Feel free to drop your blocks in soap and water and let sit for a hour.

  • Cleaning those o-rings never hurt.

  • Pay attention to your hardware when taking apart your block. Video tape yourself taking it apart if you feel you wont remember how to put it back together. test leak them before installing again.

  • Ensure that you thoroughly rinse and dry your block before putting it back together.


Cleaning fittings can be done quick and dirty. Simply get your toothbrush and soap, do a quick scrub and rinse, and dry off. Ensure that there’s no old fluid inside or out. For tough to reach spots, you can grab a toothpick and clean inside your fitting.

Reservoirs & Pumps

Similar to your blocks, you want to scrub your reservoir components down to ensure that there’s no debris or old coolant stuck in your reservoir. If you’re using a D5 pump, you can easily take off the top as it’s magnetic, and scrub that down. Other pumps such as DDC pumps often times require some disassembly but can also be cleaned.

  • If you decide to unassemble one of our reservoirs, be sure to reassemble it properly. For more information and instructions visit our extensive reservoir page.


Sometimes tubing catches old fluid debris and needs some extra help. High pressure water or a small soft brush can be used to rid and clean of that debris.


We recommend revisiting step 1 of this guide and following the Rad Clean instructions. The next step will also help with radiators as our System Reboot helps with clearing old fluid.

STEP 4 - Reassemble your loop

Get that lovely loop back together. Ensure that it’s leak free as clean as can be. You can do a flush to be extra safe that there’s no debris that may have entered your system on the reassembly. Once you feel go to Step 5 for adding system reboot.

Step 5 - System Reboot

Primochill System Reboot was created to address the need to prepare/clean existing cooling loops AND be able to clean out old dyes that may have leached onto components during previous usage. Similar to Sysprep this flush style solution will cleanse out any debris/residue leaving your water cooling loop clean, clear, pristine and ready for any type of coolant. The beauty of ReBoot is it's ability to pull color from stained components.

  1. Install your cooling loop and double-check connections to ensure loop is “closed”. No Leaks!

  2. Empty bottle of ReBoot into 1 US Gallon of fresh DI or Distilled water, and shake for 30 seconds

  3. Add mix to cooling loop.

  4. Fill loop with treated solution and be sure to remove as many air bubbles as possible.

  5. Start loop pump and begin circulating the treated solution.

  6. Run treated solution for at least 24 to 48 hours to ensure loop is properly flushed and treated.  While using for longer periods of time doesn't have negative effects, ReBoot is not an effective final coolant and should be replaced with coolant before any extended use of computer.

  7. Drain System. Inspect drained solution for debris or foreign particles. Dispose of drained solution. Repeat flush if needed.

  8. Fill system with fresh DI or distilled water and flush thoroughly to remove ReBoot solution checking for foam.

  9. Drain system.*

*Reboot needs to be flushed from the system until no foam is seen and water runs clear


Now onto the big question. What fluid are you deciding to use? As you may have found out from first hand experience, each fluid has their pros and cons and for extensive information checkout our fluid page. So now to answer the big question. A base fluid or another fluid?






Opaques, show coolants and colored TRANSPARENCY fluids.