I agree with Diggs. We have rented a few boats with hot tubs and the different manufacturers and lakes have had different methods for handling water. The boats at Don Pedro have tanks for the greywater. Anytime you empty or fill the tub it comes from the same tank. When you move the boat you have to drain the tub. Only problem was the water got kinda funky since they dont actually change it all the time (we brought our boat in to have the water changed). They actually chlorintate the water and run it through a filter like a home tub. The boats at Melones used fresh water from the lake. I kinda like that deal better. Filled from the lake and drained back in. No chemicals needed. Only issue is to make sure you fill the tub before you get into shore so you don't suck up dirt and funk. Whatever, that seems like a lame deal. I think the bigger problem at Shasta is with the old boats that dump shower water straight back into the lake. Wouldn't be a problem if people would use the Bio-degrageable soap, but I think most people are too lazy.
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