I've been in the hot tub industry for over 30 years and ANYONE thinking this is a good idea needs to rethink it. Everything about this in regards to heating, plumbing and lack of any filtering is going to produce some serious safety and potential health risks. Its the reason why there are companies who specialize in making hot tubs and equipment that is SAFE! Yes, they are more expensive, but they will last! The average wooden tub from most manufacturers (not including ANYTHING coming out of China) will easily last 25-40 years if properly maintained. Everything about this tub (not the plumbing) build is certainly doable, although the choice of the liner, which will hold the water, may not hold up well exposed to the heated water or to the chemistry of the water (either source water in some areas and the added chemicals) Chlorine will definitely deteriorate the liner along with the heated water, especially if this is a tarp or even a pool liner. Neither will last long in this application. I've seen plenty of "cowboy" hot tubs and the biggest mistake is the lack of proper safety measures in the heating and circulation. Have fun, be creative, but not at the risk of your or friend's safety and health!
Cheers for the advice, i was 15 when i built this as a summer project and only used it for a couple months. It has since been turned into two hexagonal flower beds! I ended up fibreglassing the inside and yeah, the plumbing and filtration took a lot of work to sort out (in a second video i haven't uploaded). For sure, if i wanted anything more permanent i will go with a professional kit at least. thanks again tho!
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