Playbook section
Water Chemistry
Testing, interpretation, dosing, water balance, contamination, and common conditions.
- GuideBLX-FND-005 · v1.3
Sanitization, Disinfection, and Oxidation
A practical pool guide to disinfectant residuals, chlorine demand, oxidation, free and combined chlorine, stabilizer, salt systems, bromine, and supplemental treatment.
- GuideBLX-FND-006 · v1.2
Water Balance and Saturation Fundamentals
A field-first guide to pH, alkalinity, calcium, temperature, salt and TDS, carbonate corrections, saturation indices, scale tendency, and cementitious-surface protection.
- Field ReferenceBLX-QRF-001 · v1.3
Water-Chemistry Targets and Decision Bands
A fast pool and spa reference separating public-health baselines, field planning aims, equipment and surface limits, diagnostic bands, and stop conditions.
- Field ReferenceBLX-QRF-002 · v1.3
Test Accuracy, Sample Handling, and Common Interferences
Decide whether a test result represents the water, falls within the method's range, survives known interferences, and is reliable enough to act on.
- ProcedureBLX-SOP-008 · v1.3
Collecting and Testing a Water Sample
Collect a sample that actually represents the pool or spa, run the approved test within its limits, catch interference, and record a result worth acting on.
- ProcedureBLX-SOP-015 · v1.3
Testing Free and Combined Chlorine
Measure free and total chlorine, calculate combined chlorine, recognize an invalid result, and hand off a pool or spa reading that supports a real decision.
- ProcedureBLX-SOP-016 · v1.3
Testing pH, Alkalinity, Hardness, CYA, and Salt
Measure pH, total alkalinity, calcium hardness, cyanuric acid, and salinity without mixing up methods, ranges, corrections, or pool or spa operating context.
- Field ReferenceBLX-QRF-006 · v1.2
Saturation Index Field Reference
Calculate calcium-carbonate saturation the same way every time, including corrected alkalinity, method choice, prediction limits, and treatment decisions.
- ProcedureBLX-SOP-009 · v1.3
Calculating and Adding Pool Chemicals
A master field procedure for converting a validated test into a checked dose, handling one approved product safely, documenting the addition, and verifying the result.
- ProcedureBLX-SOP-017 · v1.2
Adding Liquid Chlorine
Verify the water, product, strength, volume, and dose before staging and adding sodium hypochlorite to a pool or spa.
- ProcedureBLX-SOP-018 · v1.2
Adding Muriatic Acid
Lower pH or support an alkalinity plan with the exact hydrochloric-acid product, a checked calculation, controlled handling, deliberate application, and a verified result.
- ProcedureBLX-SOP-019 · v1.2
Adding Approved Dry Pool Chemicals
A control procedure for identifying, calculating, staging, and adding one approved dry pool chemical by its own label without moisture, dust, residue, or incompatible mixing.
- ProcedureBLX-SOP-020 · v1.3
Adjusting Salt and Cyanuric Acid
Adjust salinity or cyanuric acid only after confirming the reading, exact product, system limits, water volume, chlorine plan, and likely long-term effect.
- ProcedureBLX-SOP-021 · v1.2
Adjusting Total Alkalinity and Calcium Hardness
Plan and verify staged alkalinity or calcium-hardness corrections without losing control of pH, saturation balance, surfaces, or equipment limits.
- Troubleshooting GuideBLX-DIA-003 · v1.3
Chlorine Reading Is Unexpectedly Low or High
A decision path for validating an unexpected free-chlorine result and separating testing error, production, demand, dilution, recent treatment, and control causes.
- Troubleshooting GuideBLX-DIA-004 · v1.3
pH Will Not Hold
When pH will not hold, check the test itself before sorting carbon-dioxide rebound, weak buffering, chemical inputs, source water, and automated control.
- Troubleshooting GuideBLX-DIA-005 · v1.3
High Cyanuric Acid
Confirm high cyanuric acid before acting, stop the source, protect sanitation, and plan water replacement or specialist treatment safely.
- Troubleshooting GuideBLX-DIA-006 · v1.3
Cloudy Water
Treat cloudy water as a visibility hazard first, then sort debris, filtration, air, precipitation, product, and biological causes using observable evidence.
- Troubleshooting GuideBLX-DIA-007 · v1.3
Visible Algae or Repeated Algae Growth
Restrict use when needed, confirm that the growth is algae-like, remove the biomass, restore CYA-aware sanitation, and find out why it came back.
- Troubleshooting GuideBLX-DIA-008 · v1.2
Scale, Stains, or Colored Water
Identify whether the evidence is loose scale, a surface stain, dissolved color, precipitated metal or mineral, biological growth, or finish damage before treating it.
- Troubleshooting GuideBLX-DIA-009 · v1.3
Foaming in a Spa or Hot Tub
Tell normal spa aeration from persistent surfactant foam, then work through sanitizer, organic load, products, water age, hardness, filtration, and biofilm.
- Field ReferenceBLX-QRF-007 · v1.2
Partial Drain and Water-Replacement Calculations
A planning reference for fill-water-adjusted dilution, partial replacement, repeated cycles, predicted chemistry, discharge limits, structural risk, and verification.
- ProcedureBLX-SOP-030 · v1.0Commercial/Public Aquatics
Testing and Recording Public Aquatic Water Quality
Build a compliant testing schedule, collect representative samples, compare controller readings, and preserve actionable public-facility records.