I believe my clam is starting to show signs of PM. So i just got done reading on reefers 2 reefers that u should run carbon for a week to see if it helps with PM before u do a fresh water dip. Then one person said the use RO for a dip and then another person said they used tap water both got great results from there method. Dip time bewtween both was 5 to 20 minutes. so has anyone had any experience using carbon to help with PM? Has anyone tried the RO vs tap water method?