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Safety

Pool Plant & Water-Test Log

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  • Test free chlorine (or the disinfectant in use) and record the reading against your target operating range
  • Test combined chlorine: aim for as low as possible, ideally below 1 mg/l and no more than half the free chlorine reading
  • Test and record pH, keeping it in the 7.2 to 7.4 range for effective disinfection and swimmer comfort
  • Take the first test before the pool opens, then every 2 hours through the day, and a final test after closing
  • Draw the sample from 100 to 300mm below the surface, away from inlets, ideally from the deepest part
  • Record water and air temperature and check the pool looks clear with the bottom plainly visible
All checks done
Safety

Pool Plant & Water-Test Log

A simple record of every water test and tweak so you can prove the pool was safe all day and spot a problem before swimmers do.

10 checksPDF + phoneReviewed for 2026Source: Pool Water Treatment Advisory Group (PWTAG) Code of Practice and Technical Notes; HSE/PWTAG HSG179 Health and Safety in Swimming Pools
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What’s on it

10 things to check.

Everything that matters, nothing that does not. Here is the full list, exactly as it appears on the template.

  • 1Test free chlorine (or the disinfectant in use) and record the reading against your target operating range
  • 2Test combined chlorine: aim for as low as possible, ideally below 1 mg/l and no more than half the free chlorine reading
  • 3Test and record pH, keeping it in the 7.2 to 7.4 range for effective disinfection and swimmer comfort
  • 4Take the first test before the pool opens, then every 2 hours through the day, and a final test after closing
  • 5Draw the sample from 100 to 300mm below the surface, away from inlets, ideally from the deepest part
  • 6Record water and air temperature and check the pool looks clear with the bottom plainly visible
  • 7Check chemical dosing stock levels and confirm dosing pumps are running
  • 8Backwash filters as scheduled and record turbidity or pressure readings if you monitor them
  • 9If any reading is out of range, take corrective action, re-test, and record both the action and the corrected reading
  • 10Sign and time every entry so there is a clear audit trail for the day

Good to know

PWTAG advises chemical testing before opening, every two hours during operating hours and after closing, with combined chlorine kept ideally below 1 mg/l, and stresses a circular audit trail: spot the out-of-range reading, act on it, and record the evidence that it was corrected.

Source: Pool Water Treatment Advisory Group (PWTAG) Code of Practice and Technical Notes; HSE/PWTAG HSG179 Health and Safety in Swimming Pools

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