Reserve Alkalinity. 5. Cyanuric Acid Level The number of times tests 1, 2 and 3 should be made daily will depend on the attendance at the pool and the experience of the operator, but this should not be less than 4 times daily. One as soon as the operator starts in the morning, two during the day between 10 am and 4pm and the last one before the operator leaves the pool at night. In conditions of heavy bather loads more frequent tests should be made, every hour if necessary, to maintain safe conditions. Test 4 should be carried out not less than once every 7 days. Samples taken for testing purposes should be always taken from that part of the pool where the lowest reading is likely to be found. All samples for any testing should be taken in a clean glass flask by plunging it neck first into the pool to a depth of about 300-400mm before withdrawing in an upward arc, thus collecting the samples from about 300mm below the surface. The sample should then be protected from any sunlight and the tests carried out immediately.
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