Why spend much when little is required?
Jon, you've connected the right set of dots. In moderate climates like ours, servicing your own bottom will extend the life of your bottom paint significantly at very little cost. And just like every other aspect of boat ownership, someone is selling a product wherever you look that is suitable, expensive...and unnecessary.Before you leap towards spending many hundreds of dollars, consider doing what I did: First, I spoke to the diver I was using. I asked him if he had a spare regulator (or could find one) and could lash up some hose to it (I asked for 40' for my 42' boat); his price $100. I next put an ad in my company newsletter, asking if anyone was getting out of diving. That brought me a nice aluminum tank for, I think, $80. So now I have $180 invested in a system I've used for the last ten years.The tank lives permanently in a cockpit locker. If I needed to unfoul an anchor or look for a lobster, it would go into the dink. The hose and regulator are in a small bag with my fins and mask. When it's time to service the bottom, I toss the hose & regulator over the side after connecting one end to the tank, which stays rooted in the locker. I get two scrubs on my 42' boat to one tank fill,which costs me a few bucks. I paid for the hooka rig in about 4 summer months.I'm certified and you should be, too. My tank is inspected annually and hydro'd every 5 years; so should yours. This isn't a good choice for the Village Idiot or the guy who begins swilling brews with lunch. But it's a great option to have under your belt, for lots of uses.Jack