How would you recommend doing that in such a way that it looked good and the water wouldn\’t stain the tub? Ideally everything I do will last 50+ years (except for the electronics – which is unrealistic for now).
Thanks in advance
You will have to ask a spa equipment company in maui to custom make for you a system. I hear that most people use ozone purifiers for wooden tubs.
About filling, heating and recirculating systems (very common in japanese households) we cannot supply it as we would not be able to do the maintenance/send spare parts. So again, you will have to have a custom made one. You can set up very easily a system with solenoid valves and magnet switches or software controlled (LAN) automation.
About the longevity: we treat the tubs with a water repellent full penetration product which add to the natural hinoki performance against rot and mold. Said so, I think that you should consider a life-span of 10-15 years for a tub used outdoors.
We are looking forward to working with you and remain at your disposal for any problem/question.