Description:AQUARIUM SALT supplies the electrolytes fish need to help them breathe easier and remain healthy in their new surroundings. Benefits:Promotes fish healthImproves gill function; making it easier for fish to breatheProvides essential electrolytes fish need to reach peak colouration and vitalityReduces stressFacilitates osmoregulationPromotes disease recoveryFollow API Easy Care Guide and use AQUARIUM SALT when:Starting a new aquariumWhen doing water changesSolving fish problemsElectrolytes are essential for the uptake of oxygen and the release of carbon dioxide and ammonia through the gills.A lack of electrolytes may cause serious health problems. API AQUARIUM SALT, made from evaporated sea water, provides these essential electrolytes.AQUARIUM SALT does not evaporate, and is not filtered out, so it should only be added with each water change.Care should be taken when using salt with live plants, as some plants may be sensitive. Directions:Add 1 rounded tablespoon for every 20 litres or ½ rounded teaspoon for every 4 litres of aquarium water.