This bundle includes Tec Protect 2 Premixed PC Coolant (2x 1000ml) and the Core 1000ml fill bottle. Every water cooling system requires coolant for heat transfer. With the Alphacool Tec Protect 2 Clear coolant you get a ready-made mixture that already contains all the necessary additives and can be used directly from the bottle. The additives contained ensure a lower surface tension of the water, which significantly reduces the formation of foam and air bubbles. Alphacool Tec Protect 2 protects the circuit from bacteria and algae formation and is an ideal lubricant for all water cooling pumps. Tap water contains many substances that do not belong in a water cycle. Chlorine is an integral part of tap water in many countries, as it is intentionally mixed in. All these substances can contaminate the coolant, which can lead to heavy deposits in the cooling circuit. The fine cooling channels of the CPU/GPU coolers as well as the radiator fines are very quickly affected by such deposits. While you can disassemble the coolers for cleaning, it is almost impossible to completely clean an infested radiator. Alphacool Tec Protect 2 Clear is suitable for all materials that are usually integrated into the water cycle of a water cooling system. These include materials such as copper, brass, nickel, chrome plating, aluminium, acrylic glass (PMMA), POM, PPS-GF40, PETG, acrylic, PVC and EPDM/PP. Specifications: Temperature Range: -10C to 105C Color: Clear 2x 1 liter bottles With Alphacool's convenient Core 1000ml fill bottle, a water cooling system can be filled easily, uncomplicatedly and precisely even in the tightest system. The cooling liquid is filled directly into the reservoir via the flexible and narrow pipe. With the empty bottle, it is also possible to remove coolant out of the expansion tank. The large opening with screw cap makes it easy to fill the bottle. Model: TR-14467-18651-2