Active IQ Level 2 Award in Pool Operations (sample manual)

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The pool water circulation system Section 6 Section 6: The pool water circulation system In order for swimming pool water to stay safe and clear, it needs to flow through a series of processes (see figure 6.1). Figure 6.1 Schematic pool circulation (hypochlorite disinfectant: no UV) ACID INJECTION POINT POOL BALANCE TANK HEAT EXCHANGER (CALORIFIER) SIGHT GLASS TO DRAIN HYPOCHLORITE INJECTION POINT FILTER FILTER TO DRAIN COAGULANT/ FLOCCULANT INJECTION POINT BACK WASH FLOW METER SIGHT GLASS STRAINER CIRCULATING PUMPS SAMPLE POINT TO DOSING UNIT A surface draw-off system removes the surface water, and water leaves the bottom of the pool through sump outlets. In deck level pools, the water is then fed into a balance tank. The balance tank (figure 6.2) accommodates the water displaced by bathers. The balance tank also provides a means of introducing water into the system to replace water used to wash the filters. The principles and practice of pool water treatment and testing Figure 6.2 A balance tank Copyright © 2019 Active IQ Ltd. Not for resale 21
Section 9 The essential tests to ensure optimum pool water quality The comparator The traditional method of pool water testing for pH and chlorine uses a comparator. This is a very simple piece of equipment where the test sample containing the reagent dye is compared against a circular disc of different coloured pieces of glass. Ideally, the comparator should be fitted with a portable back-light which provides good quality white light to accentuate the colours, or it should be viewed against a bench-mounted white light source. Figure 9.2 A comparator The comparator should be used with the disc appropriate to the test being carried out: a pH disc (phenol red), a chlorine disc or a disc which measures bromine levels. If the comparator is viewed against a white light source, a more accurate result will be given. Figure 9.3 Chlorine, pH and bromine discs Using a comparator to measure pH 1 Select 2 Add 3 Take 4 Insert 5 Revolve the phenol red disc and insert it into the comparator. Ensure it is installed the correct way, with the numbers in the right hand corner of the comparator. a 10ml sample of water to the left hand test tube. a second clean test tube containing 10ml of water and crush a phenol red tablet into it. the test tube containing the phenol red dye into the right hand side of the comparator. the comparator disc until the colours match. The reading can be found in the bottom right hand window of the comparator. 36 Copyright © 2019 Active IQ Ltd. Not for resale
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Page 3 and 4: Different types of pools and pool o
Page 5: Section 4 The importance of good ba

Active IQ Level 2 Award in Pool Operations (sample manual)

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