RO water is water that has been purified through a Reverse Osmosis Filter to remove impurities in the water, those process also removes essential minerals as well so we recomend that you re-introduce these essential minerals into your RO water before adding to your aquarium either using Seachems Equalibrium or by mixing it with some of your tap water.

Also ideal for mixing with salt products for use in marine aquariums.

Our saltwater is produced by mixing our in house Reverse Osmosis filtered water with Redsea's Pro Salt mix.