The traditional round hot tub can also be equipped with TubCoat sides and base. The sides are then made in modules, either 6 or 8, depending on whether the diameter is 150 cm (HT 150) or 180 cm (HT 180). Joint sealer is added between each side stave and base plank before it is machined and plasticised. It keeps the module together and makes it easy to clean. The base is made in 3 parts and made in similar way. The inner diameter is either 150 cm (6 benches) or 180 cm (8 benches). The amount of water is then 1200 litres or 1800 litres.