
Best selling Coolant for water coolers
Here's a ranking of the best products in this category. To give you a quick overview, we've also added some key information about the products.
1. Alphacool Ultra Pure Water
Water produced especially for Alphacool directly from a high-quality reverse osmosis system. Purified by 5 special filters (one of which is a special reverse osmosis filter), the water is absolutely free of salts, metals and germs, i.e. all those components that are found in normal tap water. The process eliminates chlorine, odours, heavy metals such as lead, copper, cadmium, mercury, etc. Agricultural chemistry, hormones, antibiotics, pesticides, fungicides, herbicides, drug residues, carcinogenic organic chlorine compounds, radioactive substances, asbestos fibres, tar compounds, nitrites, nitrates, bacteria, viruses, fungal spores, cysts. This means that the water leaves no residue whatsoever during evaporation and no limescale deposits are formed. On the contrary: Due to the low PH value of 6.0 - 7.0, Ultra Pure Water even absorbs deposits (up to a certain amount), so that the cooling system remains permanently clean.

2. Corsair Hydro X Series XL5 Performance Coolant
Corsair Hydro X Series XL5 Performance Coolant brings your custom cooling system’s color scheme to life, available in a wide choice of vibrant translucent colors. Premixed and ready to use right out of the bottle, XL5 Performance Coolant includes anti-corrosion and anti-bacterial inhibitors that keep your custom cooling system running clean and cool. Formulated to protect copper, brass, and nickel fittings and blocks, XL5 Performance Coolant brings vivid color and cool temperatures to your custom cooling system.

Corsair Hydro X Series XL5 Performance Coolant
1000 ml, Ready-mix
3. Aqua Computer Double Protect Ultra
The manufacturer does not compromise on coolant fluids either, ensuring reliable corrosion protection for long-term stable operation with high reliability. This prevents the accumulation of metal in the fluid and, in turn, the thinning of metal components (copper, aluminum, etc.) in the water circuit.

Aqua Computer Double Protect Ultra
1000 ml, Ready-mix
4. Corsair Hydro X Series XL5
Corsair Hydro X Series XL5 Performance Coolant brings your custom cooling system’s color scheme to life, available in a wide choice of vibrant translucent colors. Premixed and ready to use right out of the bottle, XL5 Performance Coolant includes anti-corrosion and anti-bacterial inhibitors that keep your custom cooling system running clean and cool. Formulated to protect copper, brass, and nickel fittings and blocks, XL5 Performance Coolant brings vivid color and cool temperatures to your custom cooling system.

5. EKWB EK CryoFuel Mystic Fog
EK CryoFuel Mystic Fog by EK Water Blocks is a high-quality coolant additive specifically designed for water cooling systems. This coolant not only provides excellent cooling performance but also offers remarkable color stability that lasts over time. With a formulation that is 90% biodegradable, EK CryoFuel Mystic Fog represents an environmentally friendly choice. The liquid is compatible with various plastics such as acetal, acrylic, and rubber, and contains bio-growth inhibitors to prevent the growth of microorganisms. These features make the product ideal for enthusiasts and gamers who value performance and sustainability. Using EK CryoFuel Mystic Fog ensures not only efficient cooling but also an appealing aesthetic in your system, as the color particles do not sediment and the fresh coloration is maintained for a long time.
- Long color stability with intense brightness
- Compatible with acetal, acrylic, and rubber
- Contains bio-growth inhibitors
- Corrosion protection for long-lasting performance
- 90% biodegradable within 10 days.

6. EKWB EK-CryoFuel, 1000ml ready-mix - Clear
Ready-to-use transparent coolant for water cooling systems from EKWB. The bottle contains 1000 millilitres of finished mixture from the EK CryoFuel series with bio growth inhibitors and corrosion protection with high material compatibility.
The features of the EK-CryoFuel coolant at a glance:
Compatible with copper, brass, aluminum, stainless steel, acetal (POM), acrylic, rubber (NBR, EPDM, Neoprene)
Incl. bio growth inhibitors
With corrosion protection
90% biodegradable within 10 days

EKWB EK-CryoFuel, 1000ml ready-mix - Clear
1000 ml, Ready-mix
7. Alphacool Ice water
With the Alphacool Ice Water Crystal, the water cooling pioneer Alphacool fulfils the wishes of many modders and enthusiasts: crisply beautiful colours, great effects in Plexi coolers, hoses and expansion tanks as well as longevity and compatibility with the materials used. The Alphacool Ice Water Crystal series has been tested for more than 1.5 years for all possible applications in the Alphacool laboratory as well as by external testers and modders and has been found to be very good and durable. If you want to give your PC an extra portion of luminosity, you can use the Alphacool Crystal UV ice water. The UV reactivity with UV LEDs or cathodes is outstanding. With the Alphacool ice water you give your water cooling an optical highlight with best cooling performance and longevity.

Alphacool Ice water
1000 ml, Ready-mix
8. Alphacool Ice Water Crystal Blue
Instantly ready-to-use coolant from the Eiswasser Crystal series by Alphacool in blue. The bottle contains 1,000 milliliters of pre-mixed solution with high material compatibility and long-lasting color brilliance.
Features of the Eiswasser Crystal Blue coolant at a glance:
- Long color stability with intense brightness
- Very durable and long-lasting
- Compatible with copper, silver, nickel, brass, PVC, NBR, acetal, acrylic, and nylon
- Excellent thermal conductivity
- Only slightly electrically conductive
- 1,000 ml of ready-to-use coolant
- Environmentally friendly, non-hazardous material (not subject to labeling under CLP regulation)
Best cooling performance and long-lasting color stability. The Eiswasser Crystal Blue from Alphacool is designed to provide enthusiasts and gamers with the best performance and efficiency while maintaining color stability. The Eiswasser Crystal series has been tested internally and externally for over 1.5 years. The result is a pre-mixed solution for water cooling circuits that is suitable for continuous operation, delivers vibrant colors, and allows for great effects. The coolant provides an impressive appearance in acrylic coolers, tubes, and reservoirs.
The high compatibility with various materials such as copper, silver, nickel, brass, PVC, NBR, acetal, acrylic, and nylon ensures safe operation with a wide range of water cooling components.
Technical details:
- Volume: 1,000 ml
- Color: Blue
- UV-reactive: No
- Features:
- Compatible with copper, silver, nickel, brass, PVC, NBR, acetal, acrylic, and nylon
- Non-hazardous material (not subject to labeling under CLP regulation)
- Pre-mixed coolant for immediate use.

9. EKWB EK Waterblocks EK-CryoFuel Loop Cleaner + Superflush concentrate
This loop cleaning and flushing kit from EK Water Blocks ensures a clean loop free from contaminants. With the EK-CryoFuel loop cleaner, you can effectively remove manufacturing residues and impurities. The EK-Superflush is a solution for flushing out production residues, contaminants, and chemical remnants.
The combination of the two concentrates enhances the cooling performance of your loop after a successful cleaning.
Technical details:
- Content: 250 ml
- Features:
- Usable for 2 years
- Compatible with copper, brass, aluminum, stainless steel, acetal (POM), acrylic, rubber (NBR, EPDM, neoprene)
- Includes corrosion protection.

EKWB EK Waterblocks EK-CryoFuel Loop Cleaner + Superflush concentrate
250 ml, Concentrate
10. Aqua Computer Double Protect Ultra 5l canister
DP Ultra is the result of extensive testing and contains specially coordinated active ingredients that guarantee optimal protection against corrosion and excellent cooling performance. It is manufactured under high-quality standards using the highest quality, absolutely pure active ingredients entirely in Germany. DP Ultra has been specifically developed for use in PC cooling systems with copper and aluminum components and is only very minimally electrically conductive. The active ingredients also reduce bubble formation and optimize heat transfer at surfaces through improved flow behavior of the coolant, leading to optimal cooling performance in your system. DP Ultra is a clear and nearly odorless solution. DP Ultra was developed directly by Aqua Computer in collaboration with Dr. Tobias Voigt. Compared to other available ready-to-use mixtures, DP Ultra achieves very good cooling performance and improves flow behavior due to its ingredients. DP Ultra is pre-dosed and ready to use. We recommend an annual replacement of the coolant.

Aqua Computer Double Protect Ultra 5l canister
5000 ml, Ready-mix