1. Pool Cleaning and Maintenance Services: This business would use the skills of a pool technician to clean and maintain swimming pools for clients. Services could include vacuuming, brushing, and filtration, as well as chemical testing and adjustments.

2. Pool Repairs: Pool technicians could provide repair services for issues such as faulty heating or filtration systems, leaky plumbing, broken tiles, and more.

3. Pool Construction: Using the knowledge and skills of a pool technician, business owners could offer pool construction services.

4. Pool Products and Supply Store: This type of business would sell pool products such as filters, pumps, chemicals, and more.

5. Pool Design Services: A pool technician could use their skills to create custom-designed pools for clients. This could include in-ground pools, above-ground pools, and custom features such as fountains, spas, and waterfalls.