Switch off UV until all the colour has gone from the water.
Test your water quality first using Pondlab test kits.
Aerate your pond well during medication.
Wait 7 days after the final dose before treating with a different medication.
If you feel that a repeat dose is necessary, check your diagnosis carefully using the diagnosis tool on our website, a different medication may be more suitable. Always treat when you have time to observe fish and take appropriate action if they react badly.