I’ve used icc in past for costia 3 treatments a day I’m between each worked for me I used with salt I would use again my friend also used it for trich which pp didn’t shift and it worked on them

4000 gallons queni koi drum and jbr plastics bio chamber drum fed from bottom drain 3 inch gravity skimmer also into drum 55 watt submersible uv 240 litres air and 12 fishI