Penrite Demineralised Water 5L - DEWATER005
Demineralised Water is a clear, colourless and odourless purified water that has been refined by removing harmful mineral ions, salts and other impurities such as Calcium, Magnesium, Sodium, Chloride, Sulphate, Nitrate and bicarbonate that can cause destabilisation of other chemicals with which it is mixed. It is also known as deionised water and used in OEM Approved coolant Premix solutions. APPLICATION Demineralised Water is suitable for mixing with engine coolants to achieve the desired concentration level of the coolant. It can be used with both Type A (Anti-Freeze Anti-Boil) coolants and Type B (Inhibitor Only) coolants. It is suitable for all conventional type coolants including OAT and Hybrid type concentrates. It reduces mineral scale build up and the possibility of premature corrosion of the cooling system. It also lowers the possibility of a chemical reaction between the coolant, water and materials used in the radiator. If used as top up, it is recommended that the coolant also be topped to the correct concentration level. (Penrite recommend using Penrite OEM Approved Coolants for optimum performance, protection and longevity of the coolant and the cooling system). Demineralised Water can also be used in lead acid batteries as the reduction in mineral and salt ions that are commonly found in tank and tap water can drastically shorten the lifespan of a lead-acid battery. Effects of not using demineralised water are corrosion of the positive plate and mineral contaminates in the electrolyte solution which can effect metallic components and hence a loss in performance. Demineralised Water can also be used in many other applications such as steam irons, aquariums, autoclaves, laboratory, laser cutting and many more. It is also ideal for watering indoor and delicate plants as it will not cause a build-up of minerals in the soil.
Demineralised Water is a clear, colourless and odourless purified water that has been refined by removing harmful mineral ions, salts and other impurities such as Calcium, Magnesium, Sodium, Chloride, Sulphate, Nitrate and bicarbonate that can cause destabilisation of other chemicals with which it is mixed. It is also known as deionised water and used in OEM Approved coolant Premix solutions. APPLICATION Demineralised Water is suitable for mixing with engine coolants to achieve the desired concentration level of the coolant. It can be used with both Type A (Anti-Freeze Anti-Boil) coolants and Type B (Inhibitor Only) coolants. It is suitable for all conventional type coolants including OAT and Hybrid type concentrates. It reduces mineral scale build up and the possibility of premature corrosion of the cooling system. It also lowers the possibility of a chemical reaction between the coolant, water and materials used in the radiator. If used as top up, it is recommended that the coolant also be topped to the correct concentration level. (Penrite recommend using Penrite OEM Approved Coolants for optimum performance, protection and longevity of the coolant and the cooling system). Demineralised Water can also be used in lead acid batteries as the reduction in mineral and salt ions that are commonly found in tank and tap water can drastically shorten the lifespan of a lead-acid battery. Effects of not using demineralised water are corrosion of the positive plate and mineral contaminates in the electrolyte solution which can effect metallic components and hence a loss in performance. Demineralised Water can also be used in many other applications such as steam irons, aquariums, autoclaves, laboratory, laser cutting and many more. It is also ideal for watering indoor and delicate plants as it will not cause a build-up of minerals in the soil.
Demineralised Water is a clear, colourless and odourless purified water that has been refined by removing harmful mineral ions, salts and other impurities such as Calcium, Magnesium, Sodium, Chloride, Sulphate, Nitrate and bicarbonate that can cause destabilisation of other chemicals with which it is mixed. It is also known as deionised water and used in OEM Approved coolant Premix solutions. APPLICATION Demineralised Water is suitable for mixing with engine coolants to achieve the desired concentration level of the coolant. It can be used with both Type A (Anti-Freeze Anti-Boil) coolants and Type B (Inhibitor Only) coolants. It is suitable for all conventional type coolants including OAT and Hybrid type concentrates. It reduces mineral scale build up and the possibility of premature corrosion of the cooling system. It also lowers the possibility of a chemical reaction between the coolant, water and materials used in the radiator. If used as top up, it is recommended that the coolant also be topped to the correct concentration level. (Penrite recommend using Penrite OEM Approved Coolants for optimum performance, protection and longevity of the coolant and the cooling system). Demineralised Water can also be used in lead acid batteries as the reduction in mineral and salt ions that are commonly found in tank and tap water can drastically shorten the lifespan of a lead-acid battery. Effects of not using demineralised water are corrosion of the positive plate and mineral contaminates in the electrolyte solution which can effect metallic components and hence a loss in performance. Demineralised Water can also be used in many other applications such as steam irons, aquariums, autoclaves, laboratory, laser cutting and many more. It is also ideal for watering indoor and delicate plants as it will not cause a build-up of minerals in the soil.
Demineralised Water is a clear, colourless and odourless purified water that has been refined by removing harmful mineral ions, salts and other impurities such as Calcium, Magnesium, Sodium, Chloride, Sulphate, Nitrate and bicarbonate that can cause destabilisation of other chemicals with which it is mixed. It is also known as deionised water and used in OEM Approved coolant Premix solutions. APPLICATION Demineralised Water is suitable for mixing with engine coolants to achieve the desired concentration level of the coolant. It can be used with both Type A (Anti-Freeze Anti-Boil) coolants and Type B (Inhibitor Only) coolants. It is suitable for all conventional type coolants including OAT and Hybrid type concentrates. It reduces mineral scale build up and the possibility of premature corrosion of the cooling system. It also lowers the possibility of a chemical reaction between the coolant, water and materials used in the radiator. If used as top up, it is recommended that the coolant also be topped to the correct concentration level. (Penrite recommend using Penrite OEM Approved Coolants for optimum performance, protection and longevity of the coolant and the cooling system). Demineralised Water can also be used in lead acid batteries as the reduction in mineral and salt ions that are commonly found in tank and tap water can drastically shorten the lifespan of a lead-acid battery. Effects of not using demineralised water are corrosion of the positive plate and mineral contaminates in the electrolyte solution which can effect metallic components and hence a loss in performance. Demineralised Water can also be used in many other applications such as steam irons, aquariums, autoclaves, laboratory, laser cutting and many more. It is also ideal for watering indoor and delicate plants as it will not cause a build-up of minerals in the soil.
in 11 offers
The lowest price for Penrite Demineralised Water 5L - DEWATER005 right now is $8.79 at Auto Parts Guys, compared across 11 retailers.
The all-time low was $8.58 on 31 May 2026 — today's price is 2% above the lowest ever. This is at or near its all-time low — a good time to buy.
Prices last updated 20 July 2026.
Last updated at 20/07/2026 04:01:16
Penrite Demineralised Water 5L | DEWATER005
Delivery $15
Penrite Demineralised Water 5L DEWATER005
Delivery between 20–30 July $11.95
Penrite Demineralised Water 5L DEWATER005
Delivery $6.95
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Penrite Demineralised Water 5L - DEWATER005
Penrite Demineralised Water 5L DEWATER005
Delivery between 23–31 July $9.90
DEWATER005 Demineralised Water 5L
Delivery $14.99
Penrite Demineralised Water - 5 Litre
Delivery between 23–28 July $12.99
1 x Penrite Radiator & Battery Demineralised Water 5L - DEWATER005
Delivery between 23–27 July $15
Demineralised Water - Penrite 5L
Delivery $19.95
Penrite Radiator & Battery Demineralised Water Deionised Water 5L DEWATER005
Free delivery between 23–31 July
originally posted on repco.co.nz
(This product said best used within 12 months and both bottles were just on that 12 month mark, probably why it was on sale). Didn’t know at all the history of the coolant in the truck so flushed out with x2 Penrite Demineralised Water 5L as the system capacity is 7.4L and then x2 Penrite Blue OEM Approved Coolant Premix 5L.
originally posted on repco.com.au
The lower star rating is because of loose lid which enabled the can to leak water in the boot of my car.
originally posted on repco.com.au
Convenient size, sturdy bottle and good value. Used for car battery.
| Specific Gravity | 1 |
| Boiling Point Point °C | 100 |
| Solubility | Complete 100% |
Penrite Demineralised Water 5L | DEWATER005
Delivery $15
Penrite Demineralised Water 5L DEWATER005
Delivery between 20–30 July $11.95
Penrite Demineralised Water 5L DEWATER005
Delivery $6.95
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Penrite Demineralised Water 5L - DEWATER005
Penrite Demineralised Water 5L DEWATER005
Delivery between 23–31 July $9.90
(This product said best used within 12 months and both bottles were just on that 12 month mark, probably why it was on sale). Didn’t know at all the history of the coolant in the truck so flushed out with x2 Penrite Demineralised Water 5L as the system capacity is 7.4L and then x2 Penrite Blue OEM Approved Coolant Premix 5L.
The lower star rating is because of loose lid which enabled the can to leak water in the boot of my car.
Convenient size, sturdy bottle and good value. Used for car battery.
Does the job.................,,.....................,
I've been using the Penrite Demineralised water for my CPAP machine and I've had no discolouration of the humidifier (I clean and replace the water daily). The 5L bottle lasts more than 2 weeks and is still easy to pour.
It’s water…………It’s wet… yeah……………………………………………………..
Product works fine, but would be nice to have it available in 10 litres
Deionised ... demineralised. It's the same. Cheaper than drinking water. Useful for cars and irons.
Its penrite, cant do wrong with Penrite, is for all vehicles and aircrafts, same as tap water except no minerals which is good for a proper "professional" flush. I recommend only purchasing this if you are a penrite go to person, or if you want to do a one off proper clean then use tap water. Makes a difference using this though can smell and feel it through the ac 😊
Some high quality h2o right there.. I believe it deserves it’s r-spec rating.
| Specific Gravity | 1 |
| Boiling Point Point °C | 100 |
| Solubility | Complete 100% |
