I've been building for over 30 years and this is the first time I've built a hot tub for myself. I collect tube guitar amps as a hobby and think about it all the time. All in all I was satisfied with the product and the installation. All US parts are UL listed. Commercial projects require UL approval if that is your concern. I changed my layout from partially rigid to fully flexible as there is no easy transition between types. Use 1" for 3-#6 +1-#8, do not use 3/4".
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