The Hydropool Signature Self-Cleaning 455 Gold offers the best in energy efficiency and is without a doubt, the best hydrotherapy experience you can get out of a hot tub. Perfect for 2 people with seating up to four. The 455 is one of our best-sellers here in PEI. Our Signature line of hot tubs are Self-Cleaning. This means your water gets skimmed off the surface, heavy particles that fall to the bottom enter the floor vacuum, and all water is forced into a pressurized filter. This method ensures the cleaning system filters 100% of your water every 10 minutes.