Winterize the right way and open clean next spring
Pool Name / Location:
Volume (US gal):
Dimensions (L x W x avg depth, ft):
Type (chlorine / saltwater):
Surface (inground / above-ground):
Date Started:
A good close is an investment in next year. Balance and clean the water, then protect every part of the system from freezing. Do it right and you open to clear water and intact equipment, instead of a cracked pump and a green pool.
Chemical safety, every time
Never mix pool chemicals together, especially different chlorine types or chlorine and acid. Dangerous gas can form.
Always add chemical to water, never water to chemical. Pre-dissolve or broadcast per the product label.
Run the pump while you dose so the chemical circulates.
Wait, then retest before re-dosing. Add in steps rather than all at once.
Store chemicals separately, sealed, and away from kids and pets.
Closing & Winterizing Checklist
Close on a cool, sustained run of weather, with the water already balanced and clean. The whole job protects against two enemies of winter: algae taking hold and water freezing inside your pipes and equipment.
Freeze protection is the priority. Water left in pipes, the pump, filter, or heater can freeze, expand, and crack expensive parts. Blow out or drain every line, and remove drain plugs, in any climate that freezes.
Balance before you close
Test and balance the full set a few days ahead
pH 7.2 to 7.8, TA 60 to 120, CH 200 to 400
Bring FC to the high end of target for your CYA
Add winter algaecide last, per label, with pump running
Clean the pool
Brush and vacuum the entire pool
Skim the surface clean
Empty and clean skimmer and pump baskets
Clean or backwash the filter
Lower water and blow out lines
Drop water below the skimmer / returns (per your climate)
Blow out or drain all plumbing lines
Add pool antifreeze to lines if you are in a hard freeze
Install skimmer and return freeze plugs
Winterize equipment and cover
Drain pump, filter, heater, and chlorinator/salt cell
Remove drain plugs and store them in the pump basket
Remove and store the cleaner, ladders, and rails
Install the winter cover, water tubes, or safety cover
Notes
Closing test readings, antifreeze used, plugs installed, mid-winter checks to do, and what to order before spring.
Freeze-protection needs vary by climate and equipment. Follow your manufacturer instructions. Dosing and range figures are estimates from standard pool-care formulas and are not a substitute for testing your own water. Educational only. Always follow the product label and local guidance.