21St Century Pools & Spas is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Hot Tubs & Spas Supplies & Parts
• Swimming Pools Dealers
• Swimming Pools Equipment & Supplies
• Swimming Pools Service & Repair
• Swimming Pools & Spas
• Spas & Hot Tub Equipment

North American Industry Classification System (NAICS) Categories:

• Sporting And Recreational Goods And Supplies Merchant Wholesalers > Spas & Hot Tub Equipment
• Sporting Goods Stores > Water Sports Equipment Retail > Swimming Pools & Spas
• All Other Miscellaneous Store Retailers (Except Tobacco Stores) > Swimming Pools, Hot Tubs & Saunas > Hot Tubs & Spas Supplies & Parts
• All Other Miscellaneous Store Retailers (Except Tobacco Stores) > Swimming Pools, Hot Tubs & Saunas > Swimming Pools Equipment & Supplies
• All Other Business Support Services > Swimming Pool Service & Repair

Standard Industry Classification (SIC) Categories:

• Sporting And Recreational Goods And Supplies > Spas & Hot Tub Equipment
• Sporting Goods And Bicycle Shops > Water Sports Equipment Retail > Swimming Pools & Spas
• Miscellaneous Retail Stores, Nec > Swimming Pools, Hot Tubs & Saunas > Hot Tubs & Spas Supplies & Parts
• Miscellaneous Retail Stores, Nec > Swimming Pools, Hot Tubs & Saunas > Swimming Pools Equipment & Supplies
• Business Services, Nec > Swimming Pool Repair Service