71. Spas and hot tubs require a higher level of chlorine than in swimming pools. The free available chlorine concentration should be maintained at ppm with hourly checks during heavy use. {Ans: 3 0-5.0}"33. You are the aquatics manager at a very busy local gym that is open 24 hours per day, 7 days per week. This gym has a 1,850 gallon spa. This spa is in almost constant use with about 100 bathers per day using the spa (on {Ans: }28. A spa with water tested as pH 7.2, temperature 103, calcium hardness 600, total alkalinity 120, and tds of 1,500 will be: {Ans: scale forming}114. To control scaling, pool water that exceeds ppm hardness should be diluted or replaced with water of substantially lower hardness. {Ans: 800-1000}66. According to the Certified Pool - Spa Operator Handbook, the acceptable pH reading is: {Ans: 7 2 to 7 8}116. A _________ is used to radiate the high temperature of the water and cool it enough to allow the remainder of the circulation piping to the PVC. {Ans: Heat sink}23. Channeling of filters occurs when: {Ans: the FMR is exceeded, and water cuts a