do I realy need antifouling?

Hello guys..

I am in doubts whether to apply or not antifouling on my trimaran.
But I am thinking: Why to apply antifouling on my boat, if every year, or every month on a 3 months sezon I can clean my floats manualy with a scraper and a brush?
My boat is using 3 floats measuring 10m and having 60cm width and I can easily clean underneath while it stand on the water

what can you say about this?

 

Unless you are going to dive to clean the bottom every day, at the least every two days, then yes you need anti-fouling. Crud grows quickly and once it starts then you really need to pull the boat and scrub off the scum line with soap.