You will find there's plastic liner totally fitted to the inside in the tub, with spruce thermowood masking your complete exterior with the tub. This liner comes pre set up with a snug bench for sitting. We highly advise subscribing to our 6-month sanitation kit and filter shipping and delivery https://www.regionaldirectory.us/search.htm?cx=007037490239063845746%3A3gfoyqq9bvi&cof=FORID%3A11&q=Renu+Therapy&sa=Search#gsc.tab=0&gsc.q=Renu%20Therapy&gsc.page=1