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Performance Engine Oils
De-Ionised Water by Top-Up Water for Cooling Systems, Batteries & Steam Irons

De-Ionised Water by Top-Up Water for Cooling Systems, Batteries & Steam Irons


Top-Up Water De-Ionised Water - 1 Litre

1 Litre


Top-Up Water De-Ionised Water - 5 Litres

5 Litres


Top-Up Water De-Ionised Water - 25 Litres

25 Litres


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  • Description
  • Benefits
  • Shipping Explained

De-Ionised Water by Top-Up Water for Cooling Systems, Batteries & Steam Irons

De-ionised water is simply water which has been de-ionised to remove the mineral content, making it even purer than distilled water.

This De-Ionised Water from Top Up (Water) Products is a multipurpose fluid which serves a variety of applications including industrial, laboratory, automotive and domestic use.

Within the automotive sector, deionised water is ideal for maintaining your lead-acid batteries with a top-up, and using in the engine coolant systems to reduce scaling and corrosion as well as air-conditioning units. Maintaining your vehicle with this product will increase the lifespan of the battery and cooling system due to its low mineral content.

Some examples of domestic uses for this product include refilling steam irons as it helps to prevent furring, using it in aquariums and humidifiers, and it also makes an excellent staple cleaning product as it cuts through dirt with ease and leaves behind no residues or streaks.


  • Multipurpose product
  • Prevents rusting in cooling systems and steam irons
  • Essential for battery care and maintenance
  • Available in a variety of sizes


SHIPPING IS FREE* for orders of £75 and over , regardless of the weight of your order.
We've tried to keep all other shipping costs as low as we can.

Carriage starts at just £0.95 (inc VAT) for small items, with our most common courier rate set at £5.99 for orders of 5kg (enough for 5 litres of oil).

  • *Free shipping is available for UK Royal Mail, UPS Access Point™ (click & collect) and standard UK courier services (not express / priority / islands).
  • Courier surcharges mean we are unable to offer free "to the door" courier shipping from us in Cornwall up to Highlands / Grampian in Scotland - and because we send a lot of liquids, not every courier option is available to us. UPS Access Point™ (click & collect) is available as a free shipping option across Scotland, Wales and England, wherever there is a UPS Access Point™ Location.
  • Carriage charges are based on weight - please see our table of carriage costs for full details (although adding an item to your cart and viewing the calculated carriage is often easier!).
  • Priority shipping is also available.

How long will it take to get my order?

We give an estimate of delivery dates as you shop and in your basket. The vast majority of items are held in stock and dispatched from our UK warehouse and we'll do all we can to get your order to you as quickly as possible.

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