What I Wish I Knew Before Making My Wood Fire Heated Hot Tub - Video

I learned a lot from making this hot tub, and I'm glad to share it

HomeMadeModern link
https://www.youtube.com/@UC6pdMJwtkbCNoQRwbaNt77A
His Hot Tube Video
https://www.youtube.com/watch?v=HMjpWlgcK-M

Tank from Home Depot
https://www.homedepot.com/p/Behlen-2-ft-x-2-ft-x-6-ft-Stock-Tank-50130048/100319522

Charcoal
Grooves Hardwood Charcoal from Woomans, but couldn't find a link :/