Can a jacuzzi work in a natural pool?
I would strongly recommend against the use of a hot tub/spa connected to a NSP (Natural Swim Pond).
Without the usual use of disinfectants to inhibit pathogen issues, the tub/spa will quickly develop a biofilm on all of the submerged surfaces including the interior of all of the plumbing and with any heating of the water these areas will become prime breeding graounds for myriad pathogens including Legionella.
NSPs, when not constructed by a contractor certified by one of the acknowledged expert companies in this field, such as Bio Nova and Bio Top, will offer the barest of protection angainst any and all water-borne pathogens, regardless of what one may read on the internet. It is just basic biology.If the predators are absent the prey (pathogens) will flourish.