Dont let your goldfish suffer in a nasty, stale tank. Its no wonder that swimming around in their own waste makes goldfish very unwell and can even kill them. So fight back against the filth with Interpet Gold Fish Safe. Added just once a week, this little wonder freshens the water and acts as a tonic to your goldfish, giving them extra zing. Fish Safe is very easy to use; measure the volume of your tank, bowl or orb and add the correct dose using the supplied pipette or cap. One pipette treats 0.45 litres (1 pint) and one capful treats 2.05 litres (4.5 pints). Use 2 days after a weekly water change. 100ml will keep your goldfish in clean water for around 10-12 treatments. Use our online Dosage Calculator for your exact dosing requirements.