The investigation was conducted under normal commercial servicing conditions using operational swimming pools requiring recovery intervention at the time of service. Observations were therefore collected from active field environments with each pool's existing water condition, equipment configuration, filtration state, site access constraints and routine service timing.

The study was structured as a field-based documentation exercise rather than a controlled laboratory experiment. Its methodological purpose was to record engineering observations from practical recovery work, including the measurements taken, the treatment steps applied, the follow-up servicing required and the site records available for each pool.

To improve consistency across the dataset, a common service approach, testing discipline and recording process were applied as far as practical throughout the study. This provided a consistent methodological framework while preserving the real-world variation inherent in commercial field conditions.

The next section defines how pools entered the study population and how the study set was selected.

Study pools entered the investigation consecutively through normal commercial service operations rather than through separate recruitment or trial allocation. A pool was considered for inclusion when it presented for routine service in a condition requiring green-pool recovery or other significant water-quality recovery work.

Selection was therefore need-based and operational. Study pools were included because recovery intervention was required at the time of service, not because a favourable outcome was expected or because the site was considered technically convenient for documentation.

This approach produced a study population drawn from the range of conditions encountered during routine commercial work, including variation in pool size, construction type, filtration system, sanitising system and apparent contamination level. These observed differences were retained as representative characteristics of the field dataset rather than being standardised before treatment.

The selection process was intended to document real operating conditions under practical service constraints, not to create controlled laboratory conditions or an all-pool population model. All study pools meeting the inclusion criteria were assessed, tested and documented using the same methodology regardless of their individual characteristics. The next section describes the initial site assessment completed before treatment commenced.

Assessment Sequence Before Treatment

Each study pool was assessed on site before any recovery methodology was selected or treatment commenced. The assessment was completed in a consistent sequence so that subsequent recovery decisions were based on the observed condition of the pool, the available service history and the apparent operating status of the installed equipment rather than on a predetermined assumption about the required recovery procedure.

The initial inspection began with a visual review of the pool and its immediate surroundings. This included the apparent water colour, clarity and surface condition, together with any visible algae growth, settled debris, leaf matter, suspended contamination, visible equipment damage where present, or other obvious indicators of water deterioration. Where the owner was present, or where prior service records were available, recent pool history, reported changes in water condition and any relevant operating issues were also noted as part of the starting assessment.

The circulation and filtration system was then inspected to identify the installed equipment and to determine whether the system appeared capable of supporting the proposed recovery methodology. Pumps, filters, valves, returns, skimmers and associated equipment were checked visually, and a preliminary assessment of equipment operation was made where practical at the time of service. This step was used to identify any visible operational constraints that could affect the recovery procedure or the interpretation of later service observations.

No recovery decisions were made until the initial assessment had been completed. Water testing was then completed before treatment commenced so that the initial chemistry of each study pool was recorded in its untreated state. Where practicable, photographic documentation was obtained before chemical application so that the recorded starting condition of the pool was preserved as a contemporaneous field record. The completed assessment, water test results and photographic documentation formed the baseline engineering record used throughout the remainder of the recovery procedure, including the water testing and recording process described in Section 2.4.

Measurement Sequence and Recording

Water testing was completed before treatment commenced so that the initial water condition of each pool was established from measured data rather than from visual appearance alone. A consistent testing procedure was applied throughout the field study to support treatment decisions and to create a repeatable engineering record for comparison during subsequent service visits and follow-up inspections.

The principal water-quality fields recorded at the initial and Day 2 stages were Free Available Chlorine (FAC), Combined Chlorine (CC), Total Chlorine, pH, Total Alkalinity, Calcium Hardness and Cyanuric Acid. The optional third-treatment stage retained the same chemistry structure where a third treatment was required. The two-week and four-week follow-up blocks recorded FAC, CC, Total Chlorine, pH and Total Alkalinity, together with stage-specific clarity and note fields. Parameters absent from a source stage are not inferred.

For the purposes of this publication, the custom titration equipment used throughout the field study is referred to as the Dazzling Water Field Test Kit. FAC, CC, Total Alkalinity and Calcium Hardness were measured using the Dazzling Water Field Test Kit. Cyanuric Acid was measured using a Lovibond disappearing-dot comparator with Lovibond Cyanuric Acid test tablets. pH was measured using two digital pH meters. Total Chlorine is preserved as a separately recorded source value. This procedure was applied consistently across the field study so that recorded chemistry could be compared across the applicable service and follow-up stages.

Quality assurance procedures were applied throughout the field study to improve measurement consistency. Both digital pH meters were calibrated against certified standard buffer solutions at the commencement of each testing day. Reagents used with the Dazzling Water Field Test Kit were routinely replaced at approximately fortnightly intervals, and new reagent batches were verified against known standards before routine field use. These procedures were used to reduce avoidable measurement drift and to improve repeatability and confidence in the recorded water test values.

Measurements were recorded as part of the field documentation process immediately following testing. The updated dataset preserves five explicit stage labels: Initial Visit - Day 1, Follow Up Visit - Day 2, an optional third daily treatment visit, two-week follow-up and four-week follow-up. Initial green status, water-clarity scores, filter-cleaning status, brushing status and stage-specific notes are stored separately from measured chemistry. Missing cells remain not recorded rather than being reconstructed from neighbouring fields or narrative notes.

These recorded values formed the baseline and follow-up engineering record for each pool. Recovery decisions were based on measured water chemistry supported by documented field observations rather than visual assessment alone. With the testing and recording process established, Section 2.5 sets out the recovery methodology applied after the initial measurements had been obtained.

Standardised Recovery Procedure

Recovery methodology was determined only after the initial site assessment and water testing had been completed. This sequence ensured that treatment planning proceeded from a recorded engineering baseline rather than from assumption or visual appearance alone. The objective was to apply a consistent recovery methodology throughout the field study while allowing individual treatment quantities to reflect the measured condition of each pool. A consistent procedural framework was used throughout the field study, but the treatment quantities determined within that framework were calculated for each pool from the measured water chemistry, the calculated pool volume and the observed severity of contamination.

Where required, basic water balance adjustments were completed before the main recovery treatment commenced. Free Available Chlorine (FAC) was then raised to the predetermined study concentration specified by the study methodology for the recorded contamination level. Once the chlorine requirement had been established and applied, a single calculated dose of Dazzle was added based on the measured pool volume rather than by using a fixed quantity across all pools.

Following chemical application, pool surfaces were mechanically brushed to disrupt attached contamination and to improve contact between the treatment solution and the affected surfaces. The circulation and filtration system was then operated continuously during the initial recovery period so that suspended material remained in active treatment and filtration could proceed without interruption. Normal programmed circulation was resumed only after the recovery process had been completed.

Water chemistry was re-tested at the recorded Day 2 visit. A third daily treatment visit was recorded only where required; five of the 111 included recoveries contain that optional stage. Minor chemical adjustments were made where required to progressively restore the principal water-quality parameters as close as practical to their target operating ranges. Where debris settled on the pool floor, vacuuming to waste was carried out where practicable and where the pool configuration permitted.

The structured two-week and four-week records document subsequent chemistry, clarity and notes rather than additional routine treatment stages. This methodology was applied throughout the study population while allowing treatment quantities and limited follow-up water-balance adjustments to vary according to the measured condition of each pool. Section 2.6 describes the role of filtration and circulation in supporting the recovery methodology throughout the field study.

Operational Management During Recovery

Filtration and circulation formed integral components of the recovery methodology throughout the field study. They were used to support the chlorine treatment, water balance correction and measured Dazzle application determined for each pool, together with the physical removal of suspended or settled material, but they did not replace those treatment steps.

Following chemical application, the circulation system was operated continuously during the initial recovery period so that the treatment solution was distributed uniformly throughout the pool and suspended material could remain in active movement toward the filtration system. Filtration was maintained throughout the recovery process so that the chemical treatment sequence and physical removal operated together as one integrated recovery procedure.

Filter maintenance was carried out according to operating requirements rather than to a fixed time schedule. Sand or glass-media filters were backwashed when indicated by operating condition, and cartridge filters were cleaned where appropriate so that circulation and filtration could be maintained during the recovery sequence. Where debris settled on the pool floor, vacuuming to waste was undertaken where practicable and where the pool configuration permitted.

Throughout the recovery period, filtration management was intended to maintain effective circulation and maximise the physical removal of suspended material generated during treatment.

Normal programmed filtration and circulation operation resumed only after the recovery process had been completed. Section 2.7 describes the follow-up and verification process applied following completion of the initial recovery methodology.

Repeat Assessment and Verification Procedure

Study pools were revisited to monitor recovery under normal commercial operating conditions. At each follow-up, water chemistry was re-tested using the Section 2.4 method and the technician assessed colour, clarity, visible contamination and settled debris.

Filtration and circulation were re-inspected and maintained as required. Sand or glass-media filters were backwashed, cartridge filters were cleaned where appropriate, and settled debris was vacuumed to waste where practicable. Minor water-balance corrections were based on measured follow-up chemistry, with further visits continuing only where the recorded pool condition required them.

Day 2 chemistry is recorded for all 111 included recoveries. Five recoveries required the optional third daily treatment visit. Two-week and four-week chemistry are recorded for 110 recoveries; the remaining event is reported as not recorded at those stages.

The source workbook supplies stage labels rather than individual visit dates. This publication therefore uses those labels and does not infer calendar dates or elapsed-day values. Section 2.8 describes how the measurements and observations were documented.

Objective

Document how observations, measurements and supporting records were captured throughout the field study so that each pool could be reviewed as one traceable engineering record.

Field records were created contemporaneously during routine commercial servicing using the company's normal service documentation. Water test results were recorded at the time of testing rather than reconstructed later. Pool dimensions, calculated pool volume and relevant equipment information formed part of the same engineering field record so that treatment decisions could be read against the physical pool configuration recorded at attendance.

Chemical quantities applied during each treatment visit were documented together with service observations recorded as recovery progressed. Follow-up measurements, repeat water tests, treatment counts, vacuum counts and subsequent servicing were added to the same study record so that the recovery sequence remained traceable from initial attendance through the four-week stage where recorded.

Photographic documentation was obtained where practicable before, during and after recovery, and video documentation was retained where available. These visual records formed supporting engineering evidence linked to the study record rather than standalone documentation.

When the updated workbook was imported, every source row was preserved as raw source data before cleaned values were written to the structured Evidence Register. Stage-specific notes, clarity scores and status fields remain distinct from measured chemistry and calculated summaries. This maintains traceability between the source workbook, structured evidence and publication output while ensuring that missing evidence is not silently inferred. Section 2.9 outlines the limitations of the study record and dataset scope.

Objective

Document the practical limitations of the field study and define the boundaries within which the observations should be interpreted.

This study was conducted under normal commercial operating conditions rather than under controlled laboratory conditions. Defining that commercial operating context forms part of the methodology because it establishes the practical boundaries within which both the study method and the subsequent recorded observations should be interpreted.

The study population was intentionally representative of routine commercial swimming pool recovery work rather than standardised to one pool type or one starting condition. Pool size, construction, surface finish, filtration system, sanitising system, contamination level, environmental exposure and maintenance history varied naturally across the study record.

The recovery methodology itself was applied in a consistent manner across the study population, including water testing, basic balance correction, chlorine treatment, measured Dazzle application, filtration management, follow-up servicing and verification. Individual pool conditions were not standardised, and treatment quantities and servicing requirements were therefore determined according to the measured condition of each study pool.

No untreated control group formed part of this field study. Commercial scheduling, weather conditions, equipment condition and site access also remained part of the operating environment and were not removed from the study setting.

These characteristics reflect the operating environment within which commercial pool recovery normally occurs.

These methodological boundaries are defined to clarify scope rather than to reduce the value of the field record. The objective of the study was to document engineering observations under representative commercial conditions, not to eliminate the real-world variability that forms part of normal pool recovery work.

With the engineering background and study methodology now established, the following part presents the recorded observations obtained throughout the field study.

Limits on interpretation

• This is a retrospective commercial field evaluation, not a controlled laboratory trial.
• There was no untreated control group, random allocation or blinded outcome assessment.
• The complete recovery process included chlorine, balancing, filtration, filter maintenance and vacuuming, so the effect of Dazzle was not isolated.
• Pool volumes were estimated service volumes rather than independently surveyed volumes.
• Environmental conditions, equipment condition and starting chemistry varied between pools.
• Photographs were available for selected pools only and were captured as ordinary field records.
• Follow-up timing is preserved from workbook stage labels because individual visit dates were not supplied.
• Two-week and four-week chemistry are missing for one included recovery event and remain reported as not recorded.