Originally Posted by Omatako
This treatment normally lasts an easy 24 months but I don't clean between. This last round went for 30 months and I had just a light dusting of tiny barnacles at the waterline and a fine film of slime that washed of easily with a pressure washer.
BTW, I don't "have a diver", I "am the diver".
If that's the extent of your fouling after two and half years, you don't need a diver.