Spa's (hot tubs) for yachts

A couple of large yachts I have worked on use Kohler brand Whirpool (air) Baths.
They are the ones you describe, the quality is good.
They are 'off the shelf'.
There are a few rules regarding drainage times that need to be kept in mind however installation is straight forward. If you want full info on problems and what to look out for etc please PM me.

http://www.us.kohler.com/onlinecatalog/category.jsp?category=9&nsection=2&nsubsection=3&nitem=cat9
Rev

How to keep exterior Jacuzzi clean?

It seems non yacht related but I have a Jacuzzi on the boat deck and would like to know your views on keeping it clean?

It's under cover on the Boat deck but gets dirty, which isn't the main issue. When it comes to using it, we fill it with fresh water and as soon as we turn it on the water goes green.

Do you suggest keeping it full while at the dock and running it daily?
How about putting bleach in the water?

Any suggestions appreciated, on past yachts this hasn't been an issue because the Jacuzzi was inside.

As your location is warm warm compared to here, I don't know if you would WANT it heated, to 104F as we do with our outdoor tub. The immediate turning green would be from the general heat of your climate/sunlight and standing water in pump/pipes. Pool chlorine OR bromine (never mix) will help keep it clean and sanitary. You also wouldn't have to flush and fill every time you wanted to use it. It should have a recirculating cycle to keep water moving, with or without heat. This thread started with a ?? about a trough of some sort to contain slopping water, though maybe you could just drop it's capacity to 50% or less while away from the dock, or until your destination allows it to be filled without sloshing water everywhere. (Chlorinated water and nice carpets don't mix. Also, if chlorinating to keep water from going to pond scum, I'd check with local laws regarding dumping of said water...Unless the boat is of a size where you can be out most times without the water ending up all over the deck, I think they're rather silly.

i impress myself with my knowledge years after the fact of my impressing....

Very few are custom. For the most part they're all off the shelf for the domestic market until you get to the very large spas found on 60m+ yachts. One drawback with the overflow tubs (the splashing over the edges tubs) is that you HAVE to fill them to the top - and that little trough is not enough to catch the slop of even a mildly rolly anchorage. If you don't have good zero speed stabs you're going to struggle. The regular tubs with suction at the bottom give you the option of filling halfway which can be handly.

Oddly enough Balboa there's a company by the same name that produces spa units - they're pretty cheap and compact if you have a small tub. Jandy do a pretty good control pack which has lots of options and decent ability to replace faulty parts; its a bit large though.

A lot depends on the size you're thinking of and what power/space you have available. Where's the boat and whats your electrical system?