"RE: Virkon" 7:43pm Friday 21st Sep | message edited once
joined: 13th Jul 10
last here: 10:30pm Friday 14th Jun
posts: 3011
from: West Yorkshire
I always dose to this level and don't experience any problems. Since I fitted my drum I don't have to clean the filters as often if it was a weekly dose though I would dose 5-10 grams per 1000gals.