What’s included Learn the material: Swimming Pool (C-53) Study Guide Book Pass the test: Swimming Pool (C-53) Practice Exam What this covers Per the state's classification, a C-53 contractor designs, constructs, and services swimming pools, spas, hot tubs, and related water features including excavation, plumbing, gunite, electrical, and pool equipment. This printed book covers the subjects the state tests. See the official CSLB C-53 classification. Sample questions — Try our free practice test NSPI stands for:A. Non-standard Pool Inspection · B. Normal Swimming Pool Installation · ✓ C. National Spa and Pool Institute · D. National Swimming Pool Industry If the soils surrounding a pool are slow draining, what type of soil is present?A. Clay · ✓ B. Gravel · C. Sand · D. Cement grout When beginning excavation for a swimming pool, where do you start?A. Where the skimmer will be · B. The deep end · ✓ C. The shallow end · D. Where the main drain will be