Use saved test results
Save test results so Poolometer can use your FC and CYA here.
Winterization Boundary
Treat closing and winter blowout as a system isolation task. Safe inspection comes first; pressurized air, heater drainage, and specialty valves do not.
- ✓ Remove accessories, document water level, and follow the exact manual for the pool type and climate.
- ✓ Confirm plugs, returns, skimmers, and valve positions before you assume the line is isolated.
- ✓ Write down what was drained, plugged, or bypassed so spring restart starts from facts.
- ★ Blow out lines, winterize heaters, or isolate in-floor or specialty plumbing when the zone layout is not fully understood.
- ★ Drain and preserve equipment that depends on model-specific service steps.
- ★ Handle compressed-air winterization when the correct valve path is not obvious.
- ⚠ You cannot verify which line is isolated, or the system still contains pressure you cannot explain.
- ⚠ A heater, pump, or controller behavior makes the winterization path unclear.
- ⚠ Any freeze-risk situation that would get worse if you guess at the next step.
Deep clean and resolve algae before you touch plumbing or a cover.
- ✕Do not hide a green or contaminated pool under the cover
- ✕Do not use automotive ethylene-glycol antifreeze in pool plumbing
FC / pH / CYA / TA / CH
Winter Closing Playbook
Close the pool with clean water, balanced winter chemistry, protected plumbing, and a cover setup that is actually safe.
Deep clean before shutdown
Organic debris left in the pool is future chlorine demand and future stain risk.
Balance around defensible winter ranges
Use ranges that protect the surface and equipment instead of magic numbers.
- For plaster and aggregate pools, pay extra attention to CH and saturation index before closing.
Final sanitizer step
The goal is to close with clean, adequately chlorinated water.
Winterize plumbing and equipment
This is the mechanical heart of the closing process.
- Never use automotive ethylene-glycol antifreeze in pool plumbing.
Set water level for the cover system
Water level depends on the cover strategy and the winterizing procedure.
Treat the cover as a safety system
The closing is not finished until the site is secure.
Educational guidance only. Verify labels, manuals, local code, and site conditions before acting. Stop for electrical, gas, structural, drain, drowning, injury, emergency, or chemical-mixing risk.